Geophysical abstracts 104-107 January-December 1941

by Ayvazoglou, W. 1871-1956.
Published: U.S. G.P.O., 1942

Geophysical abstracts 87, July-December 1936

by Ayvazoglou, W. 1871-1956.
Published: U.S. G.P.O., 1937

Patents on geophysical prospecting issued in the United States, England, Canada, Australia, Germany, France, and Russia

by Ayvazoglou, W. 1871-1956.
Published: U.S. Dept. of the Interior, Bureau of Mines, 1936

Geophysical abstracts 88-91, January-December 1937

by Ayvazoglou, W. 1871-1956.
Published: U.S. G.P.O., 1938

Geophysical abstracts 96-99, January-December 1939

Published: U.S. G.P.O., 1940

Geophysical abstracts 100, January-March 1940

Published: U.S. G.P.O., 1940

Geophysical abstracts 91, October-December 1937

Published: U.S. G.P.O., 1938

Geophysical abstracts 97, April-June 1939

Published: U.S. G.P.O., 1940

Geophysical abstracts 98, July-September 1939

Published: U.S. G.P.O., 1940

Geophysical abstracts 99, October-December 1939

Published: U.S. G.P.O., 1940

Geophysical abstracts 110, July-September 1942

Published: U.S. G.P.O., 1943

Geophysical abstracts 111, October-December 1942

Published: U.S. G.P.O., 1943

Geophysical abstracts 108, January-March 1942

Published: U.S. G.P.O., 1942

Geophysical abstracts 101, April-June 1940

Published: U.S. G.P.O., 1941

Geophysical abstracts 102, July-September 1940

Published: U.S. G.P.O., 1941

Geophysical abstracts 103, October-December 1940

Published: U.S. G.P.O., 1941

Geophysical abstracts 88, January-March 1937

Published: U.S. G.P.O., 1937

Geophysical abstracts 89, April-June 1937

Published: U.S. G.P.O., 1938

Geophysical abstracts 90, July-September 1937

Published: U.S. G.P.O., 1938

Geophysical abstracts 92, January-March 1938

Published: U.S. Govt. Print. Off., 1938