Checkpoints to accompany You and the Environment
Subtitle: an investigative approach
By: Educational Research Council of America ; authors of the revised Checkpoints : Gary D. Day, Dennis L. Harvey, Donald G. Pegler, Ernest J. Fena
Contributors: Day, Gary D.; Harvey, Dennis L.; Pegler, Donald G.; Ernest J. Fena; Rasmussen, Frederick A.
Series: Houghton Mifflin science program
Publisher: Houghton Mifflin
Published: 1976
Place of publication: Boston
Language: eng
Number of pages: 59
Subjects: Biology; Experiments; Ecology
Notes: Duplicating masters -- Cover.

Authors of the original Checkpoints were Frederick.A. Rasmussen, Paul Holobinko and Victor M. Showalter and published under the title: Man and the environment.