Featured in this lot is this Billings Geological Society and Mineral Deposits by Lindgren book collection. There are two books in this collection. The first the Billings Geological Society Fifth Annual Field Conference circa 1954. The second book is called Mineral Deposits by Lindgren; this is a third edition revised, enlarged and entirely reset Third Impression circa 1928. The condition of this collection of Geological and minerals books is well preserved with some wear to the corners of the spine and to the cover of the book with some browning to the pages but otherwise is well preserved. The measurements of these books is 11 1/4" x 8 3/4" and 9 1/4" x 6 3/8". The collective weight of these books is 5lb 14oz.