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Jonathan S, Adebayo EF, Joseph M, Tarki SK. PRODUCTIVITY MEASUREMENTS IN SOLE COWPEA FARMING: A CASE STUDY OF NORTHERN AGRICULTURAL ZONE OF ADAMAWA STATE, NIGERIA. IJGARD [Internet]. 2023 Oct. 12 [cited 2024 Dec. 23];1(1):97-103. Available from: https://ijgard.com/index.php/ijgard/article/view/12