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Archaeologists are adept at analyzing variation in artifacts. The discipline has well established and tested methods to track change through time and to evaluate the function of artifacts that depend upon measures of variation in the archaeological record. Although a critical concept, the means by which variation in material culture is generated is not well understood. This paper explores one source of variation, copying errors, and systematically examines how cultural transmission processes act to amplify, reduce, or maintain such variation. Using simple models, we generate expected distributions for the amount of variation that occurs through time under varying circumstances. This variation is caused by small errors that are transmitted from one person to another in the propagation and replication of cultural traits. These baseline values provide useful null models for explaining variation in prehistoric assemblages of artifacts. We use measurements of projectile points from Owens Valley and Woodland ceramics from Illinois to demonstrate the value of this approach.  相似文献   
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Industrialization and Foreign Politics. Some Aspects of Sweden's Economic‐Political Relations with the Great Powers, 1905–1945.  相似文献   
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This article uses correspondence from former members of theRhodesian security services, recent oral testimony from Britishpoliticians and civil servants, and newly available documentaryevidence from archives around the world, to re-examine the viabilityof British military intervention in Rhodesia during 1964 and1965. It argues that the military and political obstacles tothe use of force cited at the time and since have been grosslyexaggerated. This article argues that with sufficient resolve,the Labour government led by Harold Wilson could have used forcein an attempt to prevent or end Rhodesia's Unilateral Declarationof Independence of 11 November 1965. This might have offereda possible solution to one of the most protracted and embarrassinginternational problems that confronted successive British governmentsduring disengagement from Empire.  相似文献   
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