1. Geologic nitrogen in Pleistocene loess of Nebraska;Boyce;J. Environ. Qual.,1976
2. Total nitrogen;Bremner,1965
3. Inorganic forms of nitrogen;Bremner,1965
4. Denitrification;Broadbent,1965
5. Geology of the Mountrail County, North Dakota;Clayton;N.D. Geol. Surv., Bull.,1972