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convair submarine seaplane general dynamics generaldynamics source institution lta href relnofollowgtsan diego air and space museum archivelt sourceinstitutionahrefwwwsandiegoairandspaceorglibrarystillimageshtmlrelnofollowsandiegoairandspacemuseumarchivea drawing sketch From the Submersable Seaplane Special Collection From the Submersable