http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Keeling's world, Martin's world, Walker's world
111, 73, 93 pages : illustrations ; 28 cm.
Keeling's world : is CO2 greening the earth? -- Martin's world : CO2's glacial hideout? -- Walker's world : CO2, chemical traffic controller?