These maps appear in the following publications:
Wilkinson, David 1992a "Decline phases in civilizations, regions and oikumenes." A paper presented at the annual meetings of the International Studies Association, Atlanta, GA. April 1-4.
Wilkinson, David 1992b "Cities, civilizations and oikumenes: I." Comparative Civilizations Review 27:51-87 (Fall).
Wilkinson, David 1993 "Cities, civilizations and oikumenes: II" Comparative Civilizations Review 28
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