1. Estimation of purines and pyrimidines in soil humic acids;Anderson;Soil Sci.,1961
2. Microbial examinations of Lake Ontario sediments. I. Distributions of aerobic and anaerobic heterotrophs in several Lake Ontario sediments;Bell,1972
3. An introduction to automatic amino acid analysis with plant extracts;Boulter,1966
4. Der aminosaure-haushalt holsteinischer gewasser;Brehm;Arch. Hydrobiol Suppl.,1967
5. Inorganic forms of nitrogen;Bremner,1965