Snider, Luther C. 1882- Preliminary report on the clays and clay industries of Oklahoma, by L. C. Snider. - Norman, 1911. - xii p., 1 l., 270 p. illus., 8 pl., 2 fold. maps, fold. tab., diagrs. 24 cm. - Oklahoma. Geological survey. Bulletin no. 7 . Some plates printed on both sides of leaf. LCCN: gs 11000463 Subjects--Topical Terms: Clay--Oklahoma. LC Class. No.: TN942 / .S7