The collection consists of seven (7) instructional booklets, each focusing on a different aspect of maritime mechanics. Folded into each booklet is a test on the subject matter taken by Lt. Herschel Yim.

Herschel H.C. Yim was born in San Francisco in 1919 and worked aboard various vessels as a marine engineer. The United States Maritime Service (USMS) was established in 1938 under the provisions of the Merchant Marine Act of 1936. The mission of the organization is to train people to become officers and crew members on merchant ships that form the United States Merchant Marine per Title 46 U.S. Code 51701.

14 items.

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