Image: AetnaEarthworks1923
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Description: Aetna Earthworks, Missaukee County MI c1923. Prof. Hinsdale standing on tree crossing "moat", Prof Ruthven standing below. NRHP # 73002157
Title: AetnaEarthworks1923
Credit: The Michigan Alumnus, Volume 29
Author: University of Michigan
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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