Description
Item Description:"By Thomas Stephens and Charlotte A. Schoenborn"--Page 1.
"May 1988."
Physical Description:1 online resource (v, 72 pages) : illustrations.
Bibliography:Includes bibliographical references (pages 26-27)
Source of Description, Etc. Note:Description based on online resource, PDF version; title from cover (CDC, viewed July 11, 2018)