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
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