RT Journal Article SR Electronic T1 The origin of the potash-rich rocks; discussion JF American Journal of Science JO Am J Sci FD American Journal of Science SP 141 OP 142 DO 10.2475/ajs.s5-30.176.141 VO s5-30 IS 176 A1 Terzaghi, Ruth Doggett YR 1935 UL http://www.ajsonline.org/content/s5-30/176/141.abstract AB