Books by Warren Y. Cluff:
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Cluff, Warren Y., illust.: The Camp Fire Girls: or, The Secret of an Old Mill (published under the author's "Marion Davidson" pseudonym; Chicago and New York: M. A. Donohue and Co., n.d.), by Howard Roger Garis
Additional books by Warren Y. Cluff in the extended shelves:
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Cluff, Warren Y.: The chainbreakers (The Roxburgh Publishing Company, Inc., 1914), also by Richard James Talbot and Roxburgh Publishing Company (page images at HathiTrust)- Cluff, Warren Y.: The invaders : a story of the "Hole-in-the-wall" country (R.F. Fenno & Company, 1910), also by Jacque Lloyd Morgan and R.F. Fenno & Company (page images at HathiTrust)
Find more by Warren Y. Cluff at your library, or elsewhere.