American Association of Petroleum Geologists.
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 ... [et. al.]
Wegener, Alfred, 1880-1930.
Continental drift -- Congresses.
Physical geography -- Congresses.
Continents -- Congresses.
Waterschoot van der Gracht, W. A. J. M. van (Willem Anton Joseph Maria), 1873-1943