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Holick, M.F. (1985). The Photobiology of Vitamin D and it’s Concequence of Humans. In R. J. Wurtman, M.J. Baum and J.T. Potts (Eds). the medical and biological effects of light, Annals of The New York Academy of Sciences, Volume 453, (P.1-14) Mixed medium on masonite 24" x 24" 2006 Private Collection