Assimilation of organic nitrogen by zea mays and the influence of bacillus subtilis on such assimilation
Assimilation of organic nitrogen by zea mays and the influence of bacillus subtilis on such assimilation - Michigan : - car ; 17 x 25 cm.
A dissert. subm. in part. fulf. of the req. for. the deg. of Dr. of Phil. in the Univ. of Michigan. Repr. from soil sc. Rutgers College