Munn, Malcolm John, 1874- Geology of the oil and gas fields of the Clarion quadrangle, by M. J. Munn. Surveyed in cooperation with the United States Geological Survey. - Harrisburg, C. E. Aughinbaugh, 1910. - 112 p. 9 (i.e. 10) plates (part fold., incl. maps) 24 cm. LCCN: gs 11000345 Subjects--Topical Terms: Petroleum--Geology--Pennsylvania--Clarion quadrangle.Petroleum--Pennsylvania--Clarion quadrangle.Natural gas--Pennsylvania--Clarion quadrangle. LC Class. No.: GA61.P4 / A5 no. 3