TY  - BOOK
AU  - Toyn Bee Arnold
TI  - A study of history
U1  - 909 
PY  - 1956///
PB  - Oxford University Press
KW  - General World HistoryEQUISETALES, VEGETATIVE STRUCTURE, EQUISETALES, FRUCTIFICATIONS AND CLASSIFICATION, SPHENOPHYLLEAC, CHUROSTROBEAC, PSEUDOBORIALES, IEPIDODENDRON AND LEPIDOPHLOIOS, ULOD ENDRON AND HALONIA, SIGILARIA AND STIGMARIA, BOTRYOPTERIDACCAC, EARLY DEVONIAN PTERIDOPHYTES
ER  -