共 3 条
- [2] Development of Raw Material Sources in Northrhine-Westfalia - A Task for Regional Planning. Erzmetall: Journal for Exploration, Mining and Metallurgy, 1981, 34 (05): : 274 - 280
- [3] SINGLE FARM DEVELOPMENT OF AREA, DAIRY FARMING AND SOCIOECONOMIC FARMTYPE IN NORTHRHINE-WESTFALIA BETWEEN 1969-70 AND 1973 LANDBAUFORSCHUNG VOLKENRODE, 1977, 27 (03): : 201 - 215