01022cam a22002651 4500 gs 64000439 DLC 20260227111415.0 780216s1961 nr bf b f000 0 eng gs 64000439 (OCoLC)3645100 DLC TxU DLC premarc TN810.N5 D4 De Swardt, A. M. J. The coal resources of Nigeria, by A. M. J. de Swardt and O. P. Casey. With a section on the physical and chemical properties of the coals, compiled by G. Jefford. [Lagos, Govt. Printer] 1961. x, 100 p. plates, map, tables. 24 cm and portfolio (fold. maps, diagrs.) 25 cm. Geological Survey of Nigeria. Bulletin no. 28 Orignial imprint date covered by label: 1963. Bibliography: p. 61. Coal mines and mining Nigeria. Casey, Owen Patrick, joint author. Jefford, G. The physical and chemical resources of coals. 29941 29941