http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Bibliography of the literature on the minor elements and their relation to plant and animal nutrition
Chilean Nitrate Educational Bureau (U.S.)
The 3d ed. accompanied by 7 supplements, Apr. 1940-July 1947, and a Botanical index, 1940.