Most of the images in these collections are in the public domain. Even though you may not need to ask permission to use them, you still must cite these images unless otherwise notified! If you see any copyright notices on these pages, read them for further instructions. It is the researcher's obligation to determine and satisfy copyright or other use restrictions.
Pics4Learning (Thousands of images categorized by topic)
Wise Gorilla Free Educational Clip Art
Agricultural Research Service (Quality animal photos)
National Image Library (Photographs of wildlife and plants)
American Memory Historical Collections (Good for history topics)
America from the Great Depression to World War II
Daguerreotype Portraits and Views, 1839-1864
Selected Civil War Photographs
American Memory Map Collections
Images of American Political History
National Archives and Records Administration
Images from the History of Medicine
New York Public Library Picture Collection
Photo Library (Photos available for Web design, backgrounds, and printed areas; small collection)
Web ClipArt (Links to several public domain clip art collections)
US Government Photos and Multimedia (Dozens of links for a variety of subjects)