Public domain
MUNROE, CHARLES EDWARD, PHD. CONSULTING EXPERT, U.S. GEOLOGICAL SURVEY AND BUREAU OF MINES
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
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Credit lineMUNROE, CHARLES EDWARD, PHD. CONSULTING EXPERT, U.S. GEOLOGICAL SURVEY AND BUREAU OF MINES. 1919-01-01. Harris & Ewing. Harris & Ewing Collection, Library of Congress. Public domain.