These two geological maps were issued about 30 years prior to the formation of Acadia National Park. The lot includes Nathaniel Shaler's geological report of the island that was published in the 8th Annual Report of the U.S. Geological Survey. The first map depicts the geology of the underlying bedrock, while the second map presents the areas of the island where bedrock lies near the surface. In addition to the geology, the maps shows detailed topography via contour lines, depth soundings, villages and towns. The report includes 35 additional illustrations.

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Condition: A

Maps are in very good condition with negligible spots. Report is disbound with light scattered foxing and a few chips along the fore-edge. Condition grade is for the maps.