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1Petrology and ore geology of the Vila Real-Sabrosa-Vila de Pouca de Aguiar region, northern Portugalby Brink, Antoni Hendrik
Published 1961[Neth.], 1961.xii, 143 p. : ill., maps (some fold. in pocket) ; 23 cm. -
2by Boorder, Hugo de
Published 1965Rotterdam, Neth. : Grafisch Centrum Deltro, 1965.ix, 126 p. : ill., maps (some folded in pocket) ; 23 cm. -
3by Maijer, Cornelis
Published 1965Rotterdam, Neth. : Grafisch Centrum Deltro, 1965.161 p. : ill., maps (some folded) ; 23 cm.