Cmunicacoes dos servicos geologicos de portugal

Alkaline Igneous rocks

International Map of Natural Gas Fields in Europe

/ C[opyright] ECE, Committee on Gas, and Bundesanstalt fur Bodenforschung. General coordinator: W. Schott

Introduction to geomagnetic fields

Campbell, Wallace H.( Wallace Hall),1926-

Dictionary of geology

Ray, G. D.