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- [4] BERGISCHES-LAND AS RECREATIONAL AREA - STRUCTURE AND PROBLEMS OF COMMERCE BASED ON VARIOUS RECREATIONAL AND VACATION ACTIVITIES - GERMAN - DACHHAMANN,A MITTEILUNGEN DER OSTERREICHISCHEN GEOGRAPHISCHEN GESELLSCHAFT, 1978, 120 (02): : 379 - 380
- [8] SOME OBSERVATIONS ON PROBLEMS OF HILL AND MARGINAL LAND ECONOMIC JOURNAL, 1950, 60 (240): : 740 - 752