McCulloh, Thane Hubert, 1926- Gravimetric effects of petroleum accumulations; a preliminary summary, by Thane H. McCulloh. - Washington, 1966. - iii, 4 p. 27 cm. - Geological Survey circular 530 . - United States. Geological Survey. Circular 530. . Bibliography: p. 4. LCCN: gs 66000238 Subjects--Topical Terms: Prospecting--Geophysical methods.Gravity--Measurement.Gravimeters (Geophysical instruments)Petroleum. LC Class. No.: QE75 / .C5 no. 530