Boldrini, Marcello <br/><br/>
La fertilita dei biotipi. 

 - Milano  Vita e Pensiero  1931. 
 - 238 p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Emography.<br/>Fecundity.
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Italy.--Population.