RT Journal Article SR Electronic T1 Examination of Mr. Alfred R. 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 265 OP 281 DO 10.2475/ajs.s3-27.160.265 VO s3-27 IS 160 A1 J. Croll YR 1884 UL http://www.ajsonline.org/content/s3-27/160/265.abstract AB