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Dear Mr. Roberts,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located 2 file units concerning the Gas Screw Yacht Mar-Joy (# 228439) in the Vessel Documentation Files of the U.S. Coast Guard (Record Group 26). For access to and/or copies of these file units, please contact the National Archives at Boston (RE-BO) via email at firstname.lastname@example.org.
Additional records may be located at the National Archives at Washington, DC (RDT1). Please contact RDT1 via email at email@example.com.
We hope this information is helpful. Best of luck with your research!