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Hiking Ohio, Scenic Trails of the Buckeye State, by Robert Folzenlogen, 173 pages, 1990
Walking Cincinnati, 2nd Edition, by Darcy & Robert Folzenlogen, 160 pages, 1993
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Hiking Kentucky, Scenic Trails of the Bluegrass State, by Darcy and Robert Folzenlogen, 208 pages, 1995
Colorado's Year, A Guide to Nature's Highlights, by Robert Folzenlogen, 130 pages, 1996
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A Guide to American Zoos & Aquariums, by Darcy & Robert Folzenlogen, 324 pages, 1993
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