Exhibit 2001 Menzel
Menzel, Donald Howard, 1901 -
A Field Guide to the Stars and Planets, including the moon, satellites, comets and other features of the universe.
Boston, Houghton Mifflin, 1964.
This 1964 Field Guide to the Stars and Planets, written by Donald Menzel, Director of the Harvard College Observatory, show the stars visible in April in the Northern hemisphere, both with and without the stick figures of the constellations.