Wellmann Imre szerk.: A Magyar Mezőgazdasági Múzeum Közleményei 1971-1972 (Budapest, 1973)

Minchinton, Walter E.: The agricultural regions of England and Wales

Fig. 3 these and later attempts have shown what a complicated matter a regional have been made from the nineteenth century to define agricultural regions in terms of geology but they have so far been hampered by the absence of satisfactory geological maps of the country. 8* 115