PT - JOURNAL ARTICLE AU - Leo Lesquereux TI - On some questions concerning the coal formations of North America AID - 10.2475/ajs.s2-35.105.375 DP - 1863 May 01 TA - American Journal of Science PG - 375--386 VI - s2-35 IP - 105 4099 - http://www.ajsonline.org/content/s2-35/105/375.short 4100 - http://www.ajsonline.org/content/s2-35/105/375.full SO - Am J Sci1863 May 01; s2-35