1. Twenty Five Years of Federal Pesticide Regulations: A Pictorial History from 1947 to 1972

2. Photo credits: Department of Botany and Plant Pathology, Purdue University

3. Photo credit: Nobel e-museum

4. Photo credit: AccuNet/AP Multimedia Archive

5. Photo credit: Accunet/AP Multimedia Archive

6. Photo credit: United States Army Medical Service. 1955 Preventative Medicine in World War II. Office of the Surgeon General, Dept. of the Army. Washington.

7. Photo credit: United States Army Medical Service. 1955 Preventative Medicine in World War II. Office of the Surgeon General, Dept. of the Army. Washington.

8. Photo credit: Cushing, E.C. 1957. History of Entomology in World War II. Publication 4294. Smithsonian Institution. Washington, D.C.

9. Photo credit: Cushing, E.C. 1957. History of Entomology in World War II. Publication 4294. Smithsonian Institution. Washington, D.C.

10. Credit: Time. 1947. Time, Inc. New York

11. Photo credit: Accunet/AP Multimedia Archive

13. Photo credit: source unknown

15. Photo credit: UPI/Bettman

16. Photo credit: Wisconsin Historical Society WHI-1994

17. Photo credit: Accunet/AP Multimedia Archive

19. Credit: Wall Street Journal. Tuesday, March 4, 1969.

20. Photo credit: Accunet/AP Multimedia Archive

21. Photo credit: US EPA History office

22. Photo credit: Purdue Pesticide Programs