WHO guidelines on good agricultural and collection practices [GACP] for medicinal plants / World Health Organization guidelines on good agricultural and collection practices [GACP] for medicinal plants WHO guidelines on GACP for medicinal plants World Health Organization. Medicinal plants. Plants, Medicinal. Agriculture Drug Contamination Conservation of Natural Resources Quality Control. Materia Medica 633 WHO 2003 A053 Or. Geneva : WHO, 2003. 2003. Text vi, 72 p. ;