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Jan 1, 1947

Jan 1, 1943

Jan 1, 1947

Jan 1, 1915

By F. M. Leonard

Churn-drill hole sludge samples have proved their reliability at Cananea

Jan 5, 1951

Jan 1, 1890

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Jan 1, 1942

Jan 1, 1882

Jan 1, 1956

Jan 1, 1911

Jan 1, 1957

Jan 1, 1947

Jan 1, 1955

Jan 1, 1947

Jan 1, 1947

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Jan 1, 1907

By AIME AIME

Council may deal with any matter of general interest, for which joint action of two or more of its member societies would have been appropriate, if Council had not been established. Council may initiate and carry through projects of the general character defined in the By-Laws, for which the necessary financial provision has been made. Council may take up, and in its discretion act upon, any matter of general interest referred to it by any member society or by any other society, national, state or local, or by any branch of Government, or by any individual or group of individuals.

Jan 1, 1920

By A. N. Winsor

Increased use of private aircraft in civil engineering, mining, forestry, and other land-use activities creates an opportunity for amateur aerial photography. Taking a photograph having less than 5° tilt requires precision equipment and skilled personnel, while controlled horizontal photography is primarily a terrestrial method that has passed to the limbo of forgotten things. But the remaining possibility – oblique aerial photography – can be…

Jan 2, 1955

Jan 1, 1920