Geographia Polonica (1965) vol. 5
An Attempt to Determine the Geographical Types of Agriculture in East-Central Europe on the Basis of the Case Studies on Land Utilization
Geographia Polonica (1965) vol. 5, pp. 453-498 | 
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, Institute of Geography and Spatial Organization Polish Academy of Sciences, Twarda 51/55, 00‑818 Warszawa, Poland