Sinclair Exploration Company; US immigration laws; American Petroleum Institute; Sinclair Oil Corporation; tax matters; Sinclair Consolidated Oil Corporation - war risk claims against Germany; Hyva Corporation; Sinclair Refining Company legal case; Sinclair Navigation Company; Sinclair Oil and Gas Company - Indenture, 1917 - 1945

Sinclair Exploration Company powers of attorney (1923-1929); Admission to the US of Karel G. Margosches, a citizen of Czechoslovakia (1941); US immigration laws and requirements including obtaining of passports (1940); American Petroleum Institute - curtailment of crude oil production (conservation plan) (1928-1929); Sinclair Oil Corporation - purchase of accounts receivable from subsidiaries (1936-1937); Commonwealth of Massachusetts miscellaneous tax matters (1921-1923); Sinclair Consolidated Oil Corporation - war risk claims against Germany (1921-1928); Hyva Corporation - dissolution proceedings and correspondence (1943-1946); Jack Tupper vs Hixson O'Donnell Advertising, Sinclair Refining Company, and Sylvester Morey and Thomas E. Orr; Sinclair Navigation Company - corporate file including minutes of meetings and correspondence (1918-1938), dissolution proceedings (1939), general shipping information (*note saying contents transferred to file 3023 sinclair refining company marine department), US shipping board sale of United States Lines (1928), reports filed with US Shipping Board under the Shipping Act of 1916 (1930-1931), option to purchase tankers granted to Harry D. Carter (Oil Trading Company) (1917), forms OCR-1 and OCR-2 filed with the Department of the Interior Petroleum Conservation Division (1938-1945); Sinclair Oil and Gas Company - Indenture dated March 15, 1922 covering first mortgage fifteen year 7% gold bonds due March 15, 1937 (Chase National Bank of the City of New York) (correspondence, reports, opinion of counsel)(1922-1933)