Home Publications & Data Journal Article Bean improvement for low fertility in Africa (BILFA): I. Low soil nitrogen availability author(s) Wortmann, Charles S. published in1995 original file download full citation Wortmann, Charles S.; Lynch, Jonathan. 1995. Bean improvement for low fertility in Africa (BILFA): I. Low soil nitrogen availability. Bean Improvement Cooperative. Annual Report (USA). 38:64-65.