RT Journal Article SR Electronic T1 Observations on the crown structure of Psaronius braziliensis JF American Journal of Science JO Am J Sci FD American Journal of Science SP 149 OP 156 DO 10.2475/ajs.s4-38.224.149 VO s4-38 IS 224 A1 Derby, O. A. YR 1914 UL http://www.ajsonline.org/content/s4-38/224/149.abstract AB