http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Principles and methods for determining ecological criteria on hydrobiocenoses
proceedings of the European Scientific Colloquium, Luxembourg, November 1975
European Scientific Colloquium: Principles and Methods for Determining Ecological Criteria on Hydrobiocenoses (1975 : Luxemburg)
Sponsored by the Health Protection Directorate and others