. The geology of the goldfields of British Guiana. DIORITE, ., 12,WITH VEIN OF GRANITITE,MUTOSSE, CUYUNI RIVER. Photo by J. Williams. HORNBLENDE SYENITE, x 12,PIGEON ISLAND, ESSEQUIBO RIVER. Fhofo hy J. TTilUan

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Keywords: ., bookcentury1900, bookdecade1900, booksubjectgeology, booksubjectp