A portal to U.S. Government images and photos. Includes links to image rich government sites such as the Library of Congress, branches of the military, the U.S. Mint and the National Park Service. A wide range of images are available, from historical baseball featured in the Spalding Base Ball Guides to satellite images taken by the Landsat-7. "Most of these images and graphics are available for use in the public domain, and they may be used and reproduced without permission or fee. However, some images may be protected by license."

Thousands of on-line, copyright free photographs of Franklin and Eleanor Roosevelt, the Great Depression and the New Deal, and World War II. Find images of WPA (Works Progress Administration) projects, World War II training camp maneuvers and shipbuilding and hundreds of photos of Franklin Roosevelt.  Photographs can be easily downloaded or print copies can be ordered for a fee. 

Over 2000 photographs that are advertised on the site as "100% free for use" including for commercial redistribution and alteration.  Photographs are arranged by categories such as arts, people, objects, technology, transportation, nature, sports, etc.

Database of thousands of public domain stock photographs that may be used for both personal and commercial users.   Each photo has a license that clearly states allowable uses of image. According to the site, "unless something is clearly marked as being something other than public domain, you can assume it is free to use".  If you wish to use the image for commercial uses, be aware that model releases were not obtained.  Can search for photos by category or keyword.

Millions of books and historical documents that have been scanned by Google.  Keyword searchable. Includes both copyrighted and public domain books.  Can be used as a resource for diagrams and illustration.  Note that only public domain, out-of-copyright books, can be downloaded.

US government profiles of countries and territories around the world prepared by the Central Intelligence Agency.  Includes information on geography, people, government, transportation, economy, communications, transportation, military and transnational issues.  A special section, Flags of the World, features color images of the countries' flags.  With the exception of the official seal of the CIA which may not be copied without permission, the Factbook is in the public domain and may be copied freely.

A collection of over 25,000 clip art images in the public domain. No registration is required.  Collection is categorized into specific categories such as animals - dogs, holiday - Thanksgiving, people - children, toys, weather, wedding, zodiac, etc.  Collection can also be searched by keyword.

Collection of high-quality public domain images specifically designed for use in word processors and optimized for printing on inkjet printers.  Thousands of color graphic clips, illustrations, photographs and black and white line art.  The majority of the images are in  PNG format but can be converted on the site to jpg formats of various sizes.  Instructions are provided for integration into OpenOffice.  You can browse the collection by category or search by keyword.

Search-engine for free photos. Photos with licenses such as public domain, creative commons and other free licenses are included.  Can search by keyword or link to "popular searches".  Search results return license information and source of the image.