IDG Books,

Yale University Press,

University of Chicago Press,

MCA Home Video,

The University,

U.S. Dept. of Health and Human Services, Public Health Service, Food and Drug Administration, Center for Drugs and Biologics ; For sale by the Supt. of Docs., U.S. G.P.O.,

Rand McNally,

Three-Mile Creek Publishing Co.,

First Teacher Press ; Distributed by Gryphon House,

University of Wyoming, Geological Survey of Wyoming,

The Bureau : For sale by the Supt. of Docs., U.S. G.P.O.,

Holt, Rinehart & Winston,