http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
International Congress of Soil Science 1964 : Bucharest)
I. Official communications. General lectures. World soil map.--II. Soil physics. Soil techonology.--III. Soil chemistry. Soil biology. Soil mineralogy.--IV. Soil fertility and plant nutrition. Symposium: Biochemical problems of plant nutrition as related to their metabolism.--V. Soil genesis, classfication and cartography.