BRADSHAW, P. M. D. CONCEPTUAL MODELS IN EXPLORATION GEOCHEMISTRY THE CANADIAN CORDILLERA AND CANADIAN SHIELD - 0 - U.S.A. ELSEVIER SCIENTIFIC PUBLI 1975 - 223 pag 25 cm - 0 0 . IDEALIZED MODELS/CASE HISTORIES/THE CANADIAN SHIEL ISBN: 0-444-41314-6 Subjects--Topical Terms: CIENCIAS PURAS Dewey Class. No.: 551.9 / B81