Author: WILLIAMS, G.H.
Title: The gabbros and asssociated hornblende rocks occurring in the neighbourhood of Baltimore, MD.
Description: 1886. US Geological Survey Bulletin 28; 78 pp. 3 plts. h.t. with col. microsections, 1 fold. & col. plt. with geol. map. Orig. wrps. libr. marks on cover and title page (cancelled), contents very good, uncut.

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