Main contributor
- Hood Ice Cream3
- Illinois Department of Public Health1
- Indiana University. Department of Radio and Television.10
- John Hancock Mutual Life Insurance Company1
- Kaufman, Gloria J., 1929-20041
- Knudsen5
- Lawson's1
- Maple Lane1
- National Clearinghouse for Drug Abuse Information1
- New York City Department of Health1
- Olympia Brewing Company1
- Opportunities Industrialization Center1
- Sealtest4
- Shell1
- Sinclair Oil1
- The Wilderness Society1
- U.S. Department of the Interior1
- U.S. Park Service Department of the Interior1
- University of Toronto1
- Unknown1