1. 1. BERGH, B. O. and C. D. GUSTAFSON. 1958. Fuerte fruit-set as influenced by cross-pollination. Calif. Avocado Soc. Yrbk. 42: 64-66.
2. 2. BERGH, B. O. and M. J. GARBER. 1965. Avocado yields increased by interplanting different varieties. Calif. Avocado Soc. Yrbk. 48: 78-85.
3. 3. BERGH, B. O. 1966. Avocado tree arrangement and thinning in relation to cross-pollination. Calif. Avocodo Soc. Yrbk. 50: 52-61.
4. 4. BERGH, B. O., M. J. GARBER and C. D. GUSTAFSON. 1966. The effect of adjacent trees of other avocaco varieties on Fuerte fruit-set. Proc. Amer. Soc. Hort. Sci. 89: 167-174.
5. 5. BERGH, B. O. 1967. Reasons for low yields of avocados. Calif. Avocado Soc. Yrbk. 51: 161-172.