Random-access key to the genera of Colorado mosses
By: by William A. Weber and Patricia Nelson
Edition: Rev. ed.
Publisher: University of Colorado Museum
Published: 1972
Place of publication: Boulder
Language: eng
Number of pages: 203
Subjects: Mosses; Programmed instruction
Other titles: Key to the Genera of Colorado Mosses.
Notes: Includes descriptive material.

The key consists of IBM key-punch cards boxed with explanatory material.