TY - BOOK ID - 137288682 TI - Geology and earth sciences sourcebook for elementary and secondary schools AU - Heller, Robert L. AU - American Geological Institute. Conference Duluth, Minn.) AU - USA. National academy of sciences AU - University of Minnesota, Duluth. PY - 1962 PB - New York (N.Y.): Holt, Rinehart and Winston DB - UniCat KW - Geology KW - -Study and teaching UR - https://www.unicat.be/uniCat?func=search&query=sysid:137288682 AB - ER -