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1. Lower Precambrian rocks of the Gabbro Lake quadrangle, northeastern Minnesota, SP-13, Plate 1

1970. Green, John C. Generalized interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of Central part of Vermilli...

2. Lower Precambrian rocks of the Gabbro Lake quadrangle, northeastern Minnesota, SP-13, Plate 2

1970. Green, John C. Lineament (features that form a line) map of Gabbro Lake Quadrangle, Lake County, Minnesota, scale 1 inch = about 1.5 miles.

3. Lower Precambrian rocks of the Gabbro Lake quadrangle, northeastern Minnesota, SP-13, Plate 3

1970. Green, John C. Summary of top-direction (identification of the tops of volcanic lava flows, characteristics that can be used for the identification of lava flow t...