Ferns of San Diego County /
Witham, Helen.
Ferns of San Diego County / Helen Witham. - San Diego, Calif. : San Diego Society of Natural History, 1972. - 72 p. ; 23 cm.
Incluye bibliografia.
QK525.5 / .C25 W58
Ferns of San Diego County / Helen Witham. - San Diego, Calif. : San Diego Society of Natural History, 1972. - 72 p. ; 23 cm.
Incluye bibliografia.
QK525.5 / .C25 W58