Hidden Valley (Ski Estes Park)
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The National Park Service seemed reluctant about opening it at all, and seemed to have succumbed to local pressure. NPS landscape architect Harold G. Fowler happened to be involved in assessing its feasibility.
- Colorado Ski History: Hidden Valley (Ski Estes Park)
- Bronski, Peter (2013). Powder Ghost Towns, p. 39. Wilderness Press. ISBN 0899975186
- Musselman, Lloyd K. (1971). Rocky Mountain National Park: Administrative History, 1915-1965, p. 182. U.S. Office of History and Historic Architecture, Eastern Service Center