1880 · [Chicago]
[Chicago]: Rand, McNally & Co, 1880. Very Good. Unfolded linen-backed map. Measures 33 ½" x 24 ¾" to the inner edges of a wood and glass frame (35" x 26 ½"). Printed in full colors, coded to correspond to nine geological categories. Small tears with minor loss at a few old corner folds, very good. An unusual map for Rand McNally to issue, as geological maps were not common in their catalog, likely making this the only one they published. It was the contemporary interest in mining that motivated its publication and the inclusion of four "Mineralogical References" (Gold Districts, Silver Districts, Coal Lands, and Placer Diggings), in addition to the (truncated)
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