Editore: US Dept. of the Interior/Bureau of Mines, Washington, D. C., 1977
Da: Xochi's Bookstore & Gallery, Truth or consequences, NM, U.S.A.
Paper Back. Condizione: Very Good. No Jacket. 28pp.; SC staple-bound; lt.green w/blk.(no title on spine); some rub w/spine sunned; PONinked-out,ft.cover; clean,tight pgs. Clay & shale testing. Bureau of Mines Information Circular #8729.