Erdtman, G. <br/><br/>
Pollen and spore morphology / plant taxonomy :  gymnospermae, pteridophyta, bryophyta / 
by G. Erdtman 
 - New York :  Hafner,  1972 
 - 127 p. :  ill. ;  24 cm. 
<br/><br/> 'Corrected reprint of the 1957 edition, supplement omitted' - tp 
<br/><br/><label>LCCN: </label>66-27973