Digest of game laws for 1901 - Palmer, T. S. (Theodore Sherman), 1868 -1955 (U.S. Dept. of Agriculture, Division of Biological Survey, 1901)

A directory of Illinois systematists and ecologists - Illinois. Natural History Survey Division (Illinois Natural History Survey, 1986)

A directory of Illinois systematists, ecologists, and field biologists - Robertson, Kenneth Ray, 1941 - ([Section of Botany and Plant Pathology, Illinois Natural History Survey], 1989)

A Directory of Neotropical Wetlands (1986)

Directory of Wetlands of International Importance (1987)

Directory of Wetlands of International Importance (1990)