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99 Resources to Research & Mine the Invisible Web - College

99 Resources to Research & Mine the Invisible Web

College researchers often need more than Google and Wikipedia to get the job done. To find what you're looking for, it may be necessary to tap into the invisible web, the sites that don't get indexed by broad search engines. The following resources were designed to help you do just that, offering specialized search engines, directories, and more places to find the complex and obscure.

Search Engines

Whether you're looking for specific science research or business data, these search engines will point you in the right direction.

  1. Turbo10: On Turbo10, you'll be able to search more than 800 deep web search engines at a time.
  2. Agrisurf: If you're searching for information related to agriculture and farming, check out this engine.
  3. IncyWincy: This search engine canvasses the deep web.
  4. Direct Search: Direct Search covers the invisible web, offering results in books, government, and much more.
  5. SurfWax: The SurfWax search engine taps into the deep web and offers search tools for feeds, news, blogs, and more.
  6. ZoomInfo: Get information about corporations and job searchers here.
  7. Internet Archive: Here you'll be able to find movies, music, text, and more, even including sites and pages that no longer exist.
  8. TenKWizard: This business search engine covers Forbes, specific industries, and exchanges.
  9. ZabaSearch: This search engine serves up public records like phone numbers and addresses.
  10. Clusty: Perform your search across a number of engines at once with Clusty.
  11. BusinessResearch: This deep web search scours the business web.
  12. The Online Books Page: Here you can search for more than 25,000 full-text works.
  13. E-Print: Check out E-Print to find sites and databases for scientists and engineers from one search engine.
  14. Guggenheim Museum: Search for artists through this database.
  15. Kompass: On this search engine, you'll find entries for products, services, and companies.
  16. Scirus: Search journal sources and more with this scientific information search.
  17. TechXtra: On TechXtra, you'll be able to search for resources in engineering, mathematics, and computing.
  18. Smithsonian National Portrait Gallery: Find portraits for more than 80,000 people in this database.
  19. Science Research Portal: In this research portal, you can search the deep web for scientific topics.
  20. Infoplease: Infoplease offers a search engine that combines reference tools like an encyclopedia, atlas and almanac.
  21. Pipl: Pipl brings together profiles, public records, and documents to serve up relevant information about people.


Tap into these databases to access government information, business data, demographics, and beyond.

  1. GPOAccess: If you're looking for US government information, tap into this tool that searches multiple databases at a time.
  2. MedNets: This database makes medical information easily accessible for healthcare professionals.
  3. The Labyrinth: This database from Georgetown offers resources relating to medieval studies.
  4. Musee du Louvre: Through this arts database, you'll be able to find works at the Louvre, inventory from the Department of Prints and Drawings, American works in France, and works in French museums.
  5. Intute: This searchable database links to thousands of scholarly resources.
  6. CBDNet: Find documents from the US Department of Commerce in this database.
  7. USPTO Patent Full-Text and Image Database: Get full-page patent images with this database.
  8. Free Lunch: Through this database, you can get economic data for free.
  9. Hoover's: On this database, you'll find loads of information on businesses.
  10. Databases A-Z: Check out this list to find both open and closed access databases for research.
  11. NYPL Databases and Indexes Online: With this service from the New York Public Library, you can search multiple databases at once, and even narrow down your databases to a specific type or subject.
  12. USDA Plants: Check out the USDA's plants database to get standardized information about plants the live in the US.
  13. RECON: On this database, you'll find data for regional economic conditions.
  14. CIA Electronic Reading Room: In this database, you can search for CIA documents that have been declassified.
  15. ThomasNet: This directory specializes in industrial products and processes.
  16. PubMed: This service of the US National Library of Medicine offers millions of citations from journals and articles.
  17. Bibliomania: Bibliomania is a searchable database that offers more than 2,000 texts.
  18. Project Vote Smart: Search this database for information on government officials and candidates.
  19. US Consumer Products Safety Commission Recalled Products: Research products that have been pulled off the shelves in this database.
  20. Geospatial One Stop: Search for mappable geographic data on this database.
  21. US Census Bureau International Data Base: This database is full of demographics, world population information, and more.
  22. students and professionals.
  23. On this database, you'll get access to government grant opportunities.
  24. Penn World Tables: Find data on purchasing power parity and income for 179 countries over 50 years.
  25. NTSB Accident Database and Synopses: Use this database to research aviation accidents.
  26. EUROPA Press Release Database: Find press releases from the European Union in this database.
  27. The GDB Human Genome Database: This database offers resources for genomic segments, people, citations, and other biological data.
  28. ebrary: Here you'll find a database of over 20,000 books with full text.
  29. FindLaw: Search for cases, legal news, and more in this database.
  30. LexisNexis: This leader in information has public records, business information, unpublished opinions, and so much more.
  31. The National Archives: The National Archives offers lots of databases and records for research.
  32. Guidestar: Guidestar has lots of information about nonprofits, including fiscal reports.
  33. THOMAS: On the Library of Congress' THOMAS database, you can search Congressional documents like bills, nominations, and voting records.
  34. AAAAgency Search: Find information about advertising agencies with this searchable database.


If you're looking for something specific, but just don't know where to find it, these catalogs will offer some assistance.

  1. Library of Congress Online Catalog: Using this catalog, you can search for just about every book out there.
  2. Library of Congress Prints and Photographs Online Catalog: Go beyond Google's Image Search to find specific current and historical images with this catalog.
  3. Galaxy of Knowledge: Search the Smithsonian Institution Libraries for digital content, books, images, and more.
  4. OAIster: This catalog harvests digital resources, including text, image, and video.
  5. National Gallery of Art: You can find pieces in the National Gallery of Art's collection with this catalog.
  6. HighWire Press: This catalog has full-text, peer-reviewed content from hundreds of journals.
  7. US Copyright Catalog: In this catalog, you'll be able to search for records of works registered with the US Copyright Office.
  8. Project Gutenberg: This searchable catalog offers nearly 20,000 full text books for free.
  9. ERIC: This catalog has more than 1 million records, many of which have links to full text.
  10. SONIC: The Library of Congress' sound collection has more than 2.5 million audio recordings from both published and unpublished sources.
  11. Internet Public Library: Search the catalog of the Internet Public Library to find the information you need.
  12. Law Library of Congress: Search more than 2 million volumes in this legal collection.
  13. academic subject area.
  14. Gateway to Library Catalogs: This gateway offers links to hundreds of university and organizational catalogs.


Get hand-picked links to high quality research sources with these directories.

  1. Complete Planet: This deep web directory will connect you with more than 70,000 databases and search engines.
  2. Repositories of Primary Sources: This directory points to sites that have great sources for researchers.
  3. Librarians' Internet Index: This directory is put together by librarians, offering a searchable, human-reviewed gateway to quality sites in the visible and invisible web.
  4. Bureau of Justice Statistics: This directory covers legal and judicial statistics.
  5. Bureau of Labor Statistics: In the Bureau of Labor Statistics directory, you'll be able to find information about employment, industries, occupations, and lots more.
  6. American Hospital Directory: Check out this searchable directory to find information on US hospitals.
  7. NTSB Aviation Accident Statistics: This directory offers statistics for aviation accidents.
  8. The National Academies Press: In this directory, you can search for thousands of books and PDFs.
  9. WebLens Search Portal: In this portal, you'll find searchable journals, library gateways, and more.
  10. Country Indicators for Foreign Policy: This directory offers statistical tables for foreign policy.
  11. Economagic: This economic data directory is home to more than 200,000 data files.
  12. Directory of Open Access Journals: Find resources from more than 3100 journals with this resource.
  13. Digital Librarian: Another librarian-maintained site, this one features links to both content and databases.
  14. Geniusfind: On Geniusfind, you'll get access to topic-specific databases and search engines.
  15. offers a searchable directory of selected science web sites.
  16. INFOMINE: This library of Internet resources makes it easy to access scholarly databases, journals, books, discussion sessions, and lots more.
  17. SearchSystems: If you're on the hunt for public records, check out SearchSystems' directory.

Social Media and More

Social media sites are a great way to find content that's obscure or hasn't quite made it to the search engines yet. Use these tools and more to round out your arsenal.

  1. StumbleUpon: This social media site offers a recommendaton system for site discovery.
  2. EndNote: This citation tool allows you to search deep web databases from within the program.
  3. Reddit: Find unique content on this index.
  4. education, libraries, and more.
  5. Digg: Digg users submit content that search engines don't find, and often share links before search engines index them.
  6. The World Factbook: Find country profiles, flags of the world, and other international information in this searchable book.
  7. This social bookmarking tool offers searchable tags.


Use these guides to learn how to fine-tune your search on the invisible web.

  1. The Ultimate Guide to the Invisible Web: Learn about the details of the invisible web and get suggestions for finding invisible content with this guide.
  2. How to Search the Invisible Web: This guide provides information about the invisible and links to helpful resources.
  3. How to Search the Invisible Web: This guide discusses using databases to search the invisible web.
  4. The Invisible Web: This article discusses the invisible web and how you can use specific resources to find what you want.
  5. The Deep Web: This guide quickly discusses the deep web and offers a few tips for finding deep web information.
  6. Invisible or Deep Web: This resource from Berkeley's library discusses the invisible web and tools you can use to search it.

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