631.8 B <a id="rdfa" resource="" property="dc:creator" href="http://viaf.org/viaf/11328158" target="_new">Bear, Firman , 1884-</a> Theory and practice in the use of fertil zers; 2a .ed. New York , John Wiley & sons , London , CHampan & Hall, ltd. 1938 . ix , 360 p. ilus . tab . 23cm (THE Will agricultura series . Ed. by J.G.Lipman) <a id= "rdfa" about="http://bnjm.sld.cu/cgi-bin/item.py?idficha=bcuhcgrlyfof0100030" property = "oa:link" href="http://www.worldcat.org/oclc/651376434">WorldCat</a>