Art

1. Artcyclopedia

2. Medieval Woodcuts Clipart Collection

3. MoMA - Museum of Modern Art

4. Metropolitan Museum of Art

5. National Gallery of Art

6. SILS Art Image Browser

7. The Arts

8. Timeline of Art History

Library

1. Library Tool Box

Science

1. Animals at the Smithsonian's National Zoo

2. Association for Science Ed

3. CalPhotos

4. Earth Science Image Bank

5. Earth Shots

6. eNature.com Guides to North America

7. Environmental Education Station

8. NASA Image Gallery

9. NOOA Photo Gallery

10. Underwater World

11. Yahooligans - Science Pictures Collection

Social Studies

1. American History- Public Domain Images

2. American Memory Collections- Photos & Prints

3. Colorado Digitization Program

4. Confederate Clipart Gallery

5. Early American Portraits

6. Egyptian

7. Founding Fathers

8. Free History and Holiday Clip Art

9. Graphic Maps

10. History Images

11. Library of Congress Global Gateway World Culture and Image Resources

12. Michigan

13. Michigan and Early America

14. National Geographic Photo Galleryv

15. National Park Service Digital Image Archive 

16. National Portrait Gallery [US]

17. Picturing the Century

18. The Civil War

19. Trains

20. WorldAtlas.com Clipart

21. World Nation Flags