In 1940 Steinbeck went on an expedition to the Gulf of California (also called The Sea of Cortez) with his friend Ed Ricketts, a marine biologist. Steinbeck shared with him a deep interest in biology. The result of this trip was a joint publication, The book is in two parts. The first part narrates the voyage and records various conversations and speculations, and the second part describes the marine organisms collected by the men.


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