TY  - BOOK
AU  - Erdtman,G.
TI  - Pollen and spore morphology / plant taxonomy: gymnospermae, pteridophyta, bryophyta 
PY  - 1972///
CY  - New York
PB  - Hafner
N1  - 'Corrected reprint of the 1957 edition, supplement omitted' - tp
ER  -