TY - BOOK ID - 135885132 TI - Upper Westphalian and Stephanian Species of Alethopteris from Eruope, Asia Minor and North America. PY - 1968 PB - Van Aelst DB - UniCat UR - https://www.unicat.be/uniCat?func=search&query=sysid:135885132 AB - ER -