IDG Books,

adam.com ; Benjamin/Cummings,

Warner Bros.,

MGM Home Entertainment,

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.,

Current Medicine,

Johnson Pub. Co.,

Rand McNally,

Centaur,

University of Wyoming, Geological Survey of Wyoming,

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