PT - JOURNAL ARTICLE AU - Newberry, J. S. TI - On the age of the coal formation of China AID - 10.2475/ajs.s2-42.125.151 DP - 1866 Sep 01 TA - American Journal of Science PG - 151--154 VI - s2-42 IP - 125 4099 - http://www.ajsonline.org/content/s2-42/125/151.short 4100 - http://www.ajsonline.org/content/s2-42/125/151.full SO - Am J Sci1866 Sep 01; s2-42