On the impact of endogenous development in rural areas : proceedings of a seminar held in Assissi (Umbria, Italy), October25-27 1993 - Van der Ploeg, Jan Douwe; Circle for Rural European Studies; Centro per lo Sviluppo Agricolo e Rurale; Wageningen Agricultural University, Department of Rural Sociology (Landbouwuniversiteit Wageningen, 1993)