Implementation of effective distribution channels in the marketing of traditional rubber plantation in Tambang District, Kampar Regency, RiauShorea Khaswarina, Evy Maharani, Kausar Kausar and Yulia AndrianiE3S Web of Conf., 373 (2023) 04023DOI: https://doi.org/10.1051/e3sconf/202337304023