Some Early Ideas on the Agricultural Regions of England, in The Agricultural History Review, 1954. "Archived copy"(PDF). Archived from the original(PDF) on 2007-09-27. Retrieved 2007-03-16.{{cite web}}: CS1 maint: archived copy as title (link)
Some Early Ideas on the Agricultural Regions of England, in The Agricultural History Review, 1954. "Archived copy"(PDF). Archived from the original(PDF) on 2007-09-27. Retrieved 2007-03-16.{{cite web}}: CS1 maint: archived copy as title (link)