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Dear Mr. Stewart,
Thank you for contacting History Hub. Deck logs for the LST-474 are at the National Archives
at College Park, Maryland (Archives 2).
For information on how to access them and order reproductions, contact Archives2Reference@nara.gov.
For your father’s service records, consult this page:
https://www.archives.gov/veterans/military-service-records and read the instructions carefully.
Best of luck in your endeavor!