http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Overview of the nitrogen and phosphorus cycles in the biosphere
A video on the elements found in all living things. Nitrogen cycle.
[John P. Rafferty, narrator] ; [Melinda Leonard, director].
Title from resource description page (viewed June 7, 2022).