Books by J. Leon:
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Leon, J., ed.: Neglected Crops: 1492 From a Different Perspective, also ed. by J. Esteban Hernandez Bermejo (HTML at fao.org)
Additional books by J. Leon in the extended shelves:
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Leon, J.: Current and projected availabliity of special nursing home programs for Alzheimer's disease patients (Agency for Health Care Policy and Research, Public Health Service, Dept. of Health & Human Services, 1990), also by P. Cunningham and D. Potter (page images at HathiTrust)
Find more by J. Leon at your library, or elsewhere.