Workshop on Information Requirements for Development Planning in Developing Countries Enschede, Netherlands, International Institute for Aerial Survey and Earth Sciences, de Man, W., & Schaap, A. (1980). Proceedings of the Workshop information requirements for development planning in developing countries, Enschede, The Netherlands, February 18-23, 1980. [s.n.].

Workshop on Information Requirements for Development Planning in Developing Countries Enschede, Netherlands, International Institute for Aerial Survey and Earth Sciences, W.H de Man, a A.D.J Schaap. Proceedings of the Workshop Information Requirements for Development Planning in Developing Countries, Enschede, The Netherlands, February 18-23, 1980. Enschede: [s.n.], 1980.

Workshop on Information Requirements for Development Planning in Developing Countries Enschede, Netherlands, et al. Proceedings of the Workshop Information Requirements for Development Planning in Developing Countries, Enschede, The Netherlands, February 18-23, 1980. [s.n.], 1980.