The Gulf of California Bibliography was developed for those interested in marine sciences, with references covering a geographic area from Cabo Corrientes to Cabo San Lucas, northward to the head of the Gulf, at the mouth of the Colorado River. The East Pacific Rise at 21 deg N has been included, since it is important to Gulf researchers. Most references to the terrestrial flora and fauna of the Gulf Islands have been excluded. References were obtained through June 1991 in compiling this Bibliography.