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Ecological agriculture. What it is and how it works
Kiley-Worthington, M. Elsevier Science Ltd 1981 p.349-381
A study of the hepatic flora of an infrequently timbered forest
Weaks, T.E.; Creekmore, R.C. Elsevier Science Ltd 1981 p.383-393
Analysis of particle-borne swine house odors
Hammond, E.G.; Fedler, C.; Smith, R.J. Elsevier Science Ltd 1981 p.395-401