Books by Claude H. Hills:
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Hills, Claude H. (Claude Hibbard), 1912-2003: Maple Sirup Producers Manual (Washington: Agricultural Research Service, U. S. Dept. of Agriculture, 1976), also by C. O. Willits (multiple formats at archive.org)
Additional books by Claude H. Hills in the extended shelves:
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Hills, Claude H. (Claude Hibbard), 1912-2003: Particle size of tobacco mosaic virus (University of Missouri, College of Agriculture, Agricultural Experiment Station, 1938), also by Carl George Vinson (page images at HathiTrust)
Find more by Claude H. Hills at your library, or elsewhere.