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David Onwuchekwa, Ph.D, Onyemezikeya, Obubeleye George. TRANSPORTATION MODEL AND COST CONTROL OF PLASTIC MANUFACTURING FIRMS IN PORT HARCOURT. bj [Internet]. 2025 Feb. 24 [cited 2026 Jun. 27];2:149-60. Available from: https://bwjournal.org/index.php/bsjournal/article/view/2772