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1941
Hartnagel, C.A., 1941. Oil and Gas Developments in New York for 1940. National Oil Scouts & Landsmen's Association Yearbook 313-319.
1942
Hartnagel, C.A., 1942. Oil and Gas Activities in New York-1941. National Oil Scouts & Landsmen's Association Yearbook 12, 390-396.
Hartnagel, C.A., 1942. Oil and Gas Developments in New York During 1941. American Institute of Mining and Metallurgical Engineers Transactions 146, 371-373.