Berg, Kaj,  1899- <br/><br/>
Studies on the plankton in the lake of Frederiksborg castle / 
by Kaj Berg and Gunnar Nygaard. 
 - Kobenhavn :  A. F. Host and Son,  1929. 
 - 316 p. :  ill. ;  26 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Plankton--Denmark.
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Denmark--Plankton.