Zinc and lead occurrences in Pennsylvania
Smith, Robert Charles, 1945-
Zinc and lead occurrences in Pennsylvania [by] Robert C. Smith, II. - Harrisburg [Pennsylvania Topographic and Geologic Survey] 1977. - 1 case (xvi, 318 p. illus., maps (part fold.)) 24 cm. - Pennsylvania. M72. . - Mineral resource report ; M72. .
"Pennsylvania Geological Survey. 4th series."
78620975
Zinc ores--Pennsylvania.
Lead ores--Pennsylvania.
Zinc and lead occurrences in Pennsylvania [by] Robert C. Smith, II. - Harrisburg [Pennsylvania Topographic and Geologic Survey] 1977. - 1 case (xvi, 318 p. illus., maps (part fold.)) 24 cm. - Pennsylvania. M72. . - Mineral resource report ; M72. .
"Pennsylvania Geological Survey. 4th series."
78620975
Zinc ores--Pennsylvania.
Lead ores--Pennsylvania.