Menlo Park, California: Portola Institute, 1970. 144pp. 14 1/2" x 10 3/4". Moderate wear with a tear on the front cover and yellowing of the paper. The staple binding is coming loose from the cover. Inside pages are tight. Name written and crossed out on page 1, top corner. The photograph on the cover, courtesty of Lick Observatory, shows the M-31 Andromeda galaxy, which is considered similiar to our own in structure and size.