Sims, James <br/><br/>
Crest farming :  a strategy for research and design of cropping systems 

<br/><br/>bibliogr. p. 167-169 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Recherche agronomique<br/>Agriculture<br/>Milieu d'altitude
<br/><br/><label>Subjects--Index Terms: </label>Etats Unis  Montana