http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Symbiotic nitrogen fixation in the management of temperate forests
proceedings of a workshop held April 2-5, 1979
edited by J.C. Gordon, C.T. Wheeler, D.A. Perry.
"Supported by the National Science Foundation, Division of Applied Science and Research Applications, grant number PDR78-2220."