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Surveys.  Precise measuring and leveling on the side of Storm King mountain. May 10, 1907.

Surveys. Precise measuring and leveling on the side of Storm King mou...

Public domain scan of artwork related to technological or industrial history, free to use, no copyright restrictions image - Picryl description

Surveys.  Precise tape measurements on ice across the Hudson river between Storm King and Breakneck mountains. January 29, 1907.

Surveys. Precise tape measurements on ice across the Hudson river bet...

Public domain scan of artwork related to technological or industrial history, free to use, no copyright restrictions image - Picryl description