PT - JOURNAL ARTICLE AU - Leverett, Frank TI - Pleistocene fluvial planes of western Pennsylvania AID - 10.2475/ajs.s3-42.249.200 DP - 1891 Sep 01 TA - American Journal of Science PG - 200--212 VI - s3-42 IP - 249 4099 - http://www.ajsonline.org/content/s3-42/249/200.short 4100 - http://www.ajsonline.org/content/s3-42/249/200.full SO - Am J Sci1891 Sep 01; s3-42