Swatridge, L.A. creator Langman, R.C. Burbidge, A.A. text New York McGraw-Hill Company of Canada Limited c1963 monographic ix, 502 p. : figs. and tables ; 24 cm. L.A. Swatridge,B.A, R.C. Langman,M.A. [and] A.A. Burbidge,M.A. Includes index. Geography 910 S973 1963