TY - JOUR T1 - Upper carboniferous and lower permian conifers JF - The Botanical Review Y1 - 1950 DO - doi:10.1007/BF02873610 A1 - Florin, Rudolf SP - 258 EP - 282 PB - Springer New York VL - 16 UR - http://dx.doi.org/10.1007/BF02873610 N1 - 10.1007/BF02873610 ER -