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| Archives Grid | RLG. Nearly a million collection descriptions from thousands of libraries, museums, and archives. |
| ArchivesUSA | Sign up for a free trial. Access to holdings and contact information of more than 5,581 repositories. Indexes to 132,396 special collections. |
| Encyclopedia Britannica | Online Version. |
| Encyclopedia of World History | Bartleby. 20,000 entries that span the millennia from prehistoric times to the year 2000. |
| Encyclopedia of USA History 1840-1980 | Spartacus Encyclopedia. Information and links concerning Artists & Illustrators, Journalists & Magazines, Slavery, Woman's Suffrage, Novelists & Poets, Political Figures, First World War, Political Events & Issues, Business Leaders, Trade Unions, Famous Criminal Cases, Roosevelt and the New Deal. Many subtopics. |
| Hyper History Online | Andreas Nothiger. Timeline, maps, links. |
| Interactive Historical Timelines | Database of people and events from 1000 A.D. to the present that can be used to create graphic timelines of periods in history, as well as timelines of the lives of individuals. |
| Montana History Wiki | Montana Historical Society. collection of information resources designed to assist researchers in finding the best resource for their projects or topics. |
| Montana the Magazine of Western History | Index, 1951-2003. |
| Newspaper Archive | tens of millions of newspaper pages from 1759 to present. requires membership. |
| Northwest Digital Archives | Information about archival collections at nineteen archives in Washington, Oregon, Idaho, and Montana. |
| OCEAN Index | Links to more than 35,000 articles, images, timelines, and reviewed external links relevant to all periods of history. |
| Reading, Writing and Researching for History. | Bowdoin University. Extensive guide for college students. |
| Ready, 'Net, Go Archival Internet Resources. | Tulane University. Links to >3,000 archival sites around the world, archives search engines, "tools for finding archival data", etc. |
| Repositories of Primary Sources | University of Idaho. Over 2500 websites describing holdings of manuscripts, archives, rare books, historical photographs, and other primary sources. |
| Using Primary Sources on the Web | American Library Association. 2003. |