Nuttonson, Michael Y. <br/><br/>
Ecological crop geography of Poland and its  agro-climatic analogues in North America 

 - Washington :  American Institute of Crop Ecology,  1947. 
 - 12p.  : ill.  ; 27cm. 
 - International agro-climatological series study; 2 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agriculture<br/>Poland<br/>Crop zones<br/>Climate
<br/><br/><label>LC Class. No.: </label>PAM S469.P7N8 no.2