1. Chemical Analysis of Ecological Materials;Allen,1974
2. Cation-anion balance of field-grown crops. II. Effects of P and K fertilization and soil pH;Banwart;Agronomy Journal,1975
3. Gigaspora margarita, a new species in Endogonaceae;Becker;Mycotaxon,1976
4. Comparative carbohydrate physiology in ecto-and endomycorrhizas;Bevege,1975
5. Phosphate physiology of vesicular arbuscular mycorrhizas;Bowen,1975