PT - JOURNAL ARTICLE AU - Wieland, G. R. TI - A study of some American fossil cycads; Part VII, Further notes on disk structure AID - 10.2475/ajs.s4-38.224.117 DP - 1914 Aug 01 TA - American Journal of Science PG - 117--136 VI - s4-38 IP - 224 4099 - http://www.ajsonline.org/content/s4-38/224/117.short 4100 - http://www.ajsonline.org/content/s4-38/224/117.full SO - Am J Sci1914 Aug 01; s4-38