RT Journal Article SR Electronic T1 Examination of Mr. Alfred Wallace's modification of the physical theory of secular changes of climate JF American Journal of Science JO Am J Sci FD American Journal of Science SP 432 OP 441 DO 10.2475/ajs.s3-27.162.432 VO s3-27 IS 162 A1 J. Croll YR 1884 UL http://www.ajsonline.org/content/s3-27/162/432.abstract AB