Bear, Firman E.  1884-1967. <br/><br/>
Diagnostic techniques for soils and crops, their value and use in estimating the fertility status of soils and nutritional requirements of crops / 
Firman E. Bear and others. 
 - Washington, DC :  American Potash Instute 1948.,  xxiii, 308 p. 
 - ill. ;  26 cm. 
<br/><br/>Includes bib. 
<br/><br/> Open access. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Soils--Analysis.<br/>Soil fertility.<br/>Soils--Testing.<br/>Soils--Fertilizer.