Theory of Continental Drift : A symposium on the origin and movement of land masses both inter‐continental and intra‐continental, as proposed by Alfred Wegener. By W. A. J. M. van Waterschoot van der Gracht, Bailey Willis, Rollin T. Chamberlin, John Joly, G. A. F. Molengraaff, J. W. Gregory, Alfred Wegener, Charles Schuchert, Chester R. Longwell, Frank Bursley Taylor, William Bowie, David White, Joseph T. Singewald, Jr., and Edward W. Berry. Published by the American Association of Petroleum Geologists, Tulsa, Oklahoma, U.S.A. London (Thomas Murby and Co.), 1928. 80. Pp. X + 240