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Documentation concerning national systems of seed certification : OEEC scheme for the varietal certification of herbage seed moving in international trade
(1959)
Seed potato systems in the Philippines : a case study
Crissman, Charles C., (1989)
How accessibility to seeds affects the potential adoption of an improved rice variety : the case of the New Rice for Africa (NERICA) in The Gambia
Dibba, Lamin, (2015)