This image is a scan of a map from: The
Interpretation of Topographic Maps, R. D. Salisbury and W.
W. Atwood (1908), U.S.G.S. Professional Paper 60, 84 pp.
Caption (page bottom): Volcanism:
Geologic Map of Mount Mazama and Crater Lake National Park,
Oregon by J. S. Diller
Upper left-hand margin label: U. S.
Upper right-hand margin label:
Professional Paper No. 60 Pl. CLVI
This map is a part of the Crater Lake
Institute's collection of historic Crater Lake artifacts.