Publisher: Washington, D.C. : National Science Teachers Association, c1982.
Description: xii, 42 p. ; 28 cm. + packet of attachments (1 v. (various pagings) : ill. (some col.) ; 28 cm.)
Notes: Bibliography: p. 41-42; Clarion University Faculty Publication (Kenneth R. Mechling, 1966-1998)
Series: Project for Promoting Science Among Elementary School Principals. Handbook ; II.