Ames, Iowa: Energy and Mineral Resources Research Institute, 1976. Soft Cover. Very Good. Item #065720
Pages crisp and clean except for a small ink mark and a pencil ghost on the first page and mild toning in the upper margins throughout. Spine square and uncreased. Soft cover shows a large adhesive stain at the upper rear, toning over the spine and around the edges, a few scattered specks and fingerprints, and a tiny scuff at the left front, otherwise excellent. 66pp.; graphs and diagrams, some in color.