1. Methods of soil analysis; Part 2, Chemical and microbiological properties;American Society of Agronomy;Am. Soc. Agronomy Am. Soc. Testing Mater.,1965
2. Selenium in agriculture;Anderson;U. S. Dept. of Agriculture Handbook,1961
3. Summer foods of American widgeon, mallards and a green-winged teal near Great Slave Lake, N.W.T.;Bartonek;Can. Field Nat.,1972
4. Selective feeding by juvenile diving ducks in summer;Bartonek;Auk,1969
5. Selenium residues in fish from inland waters of the United States;Baumann,1984