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Abstract
Excerpts: USDA soil microbiologists began collecting and evaluating Rhizobium strains in 1912. Since then the collection has been continually expanded to include not only agriculturally important strains but also isolates from a wide array of legumes. The USDA Beltsville Rhizobium Culture Collection contains a wide array of root nodule bacteria that fix nitrogen in symbiosis with legumes. This catalog gives information on the collection holdings and the services provided by the staff. Strains in the collection are available to all interested persons as a service to the domestic and international agricultural and scientific community.