Ries, Heinrich, 1871-1951. Preliminary report on the clays of Alabama, by Heinrich Ries, PH. D. - Jacksonville, Fla., The Vance printing co., state printers and binders, 1900. - viii, 220 p. 23 cm. - Alabama. [State geologist] Bulletin no. 6 . At head of title: Geological survey of Alabama... LCCN: gs 05000392 Subjects--Topical Terms: Clay--Alabama. LC Class. No.: QE81 / .A15 no. 6