Rock Climbing Rocky Mountain National Park: The Crag Areas

Richard Rossiter, Falcon Press, 1998.

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A rock climbing guide to 650 routes: Prospect Mountain, Twin Sisters, Lily Mountain, Fern Canyon, Fall River Canyon, Lumpy Ridge, Cow Creek Canyon, and Dry Gulch, Big Thompson Canyon. With detailed maps, topos and written descriptions for the routes in the lowlands of Rocky Mountain National Park.

Not as comprehensive as Gillett's guide (does not cover the Monastery, Jurassic Park, or the Ironclads), but good topos and route descriptions for the areas that are covered.