MEDIUM: Three-color lithograph handcolored,
DATE: 1855
EDITION SIZE: Image size 6 5/8 x 9 3/16" (169 x 233 mm).
DESCRIPTION: A key in the lower left corner identifies different rock types. Prepared in Office of P.R.R. Exp. & Surveys By W.P.Blake.
ADDITIONAL INFO:
CONDITION: Good condition and color save for toning and some foxing.
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