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Abum caption: Metamorphic mineral assemblages of slightly calcic pelitic rocks in and around the Taconic allochton. Photomicrographs of chloritoid (Ch)-biotite (Bt) assemblages. D, Sample 509-1A, with garnet (Ga) and chlorite (Ch). All, plane-polarized light, Southwestern Massachusetts and adjacent Connecticut and New York. ca. 1966. Published as figure 16-D in U.S. Geological Survey. Professional paper 1113. 1981.