Illustrated with b/w photos. San Juan, P.R.: Department of Health, Government of Puerto Rico, 1941. Small 4to. Wraps. vii, 242 p. + plates & folding chart & folding table. 1st edition. Kingsley Davis's copy, SIGNED by him on the front cover & SIGNED a secone time inside the front cover as "Kingsley Davis, Santurce, P.R., May, 1941."A couple of small chips at top edge of front cover, stain at base of spine, minor wear otherwise, but a good copy. Uncommon.