Volume 55, Issue 2 (1956)
Southern California Academy of Sciences can be found at SCAS.
An Introduction to Early Western American Prehistory
Ruth DeEtte Simpson
The Origin of Elsinore Lake Basin
John F. Mann Jr.
Schizaster morlini, a New Species of Echinoid from the Pliocene of Imperial County, California
U. S. Grant IV and Leo George Hertlein
The Larva of Euclidimera diagonalis Dyar, (Lepidoptera; Catocalinae)
John Adams Comstock