Distances Between Cities Acting as National Midpoints in the European System, 1816-1980
收藏ICPSR1990-01-01 更新2026-04-16 收录
下载链接：
http://www.icpsr.umich.edu/icpsrweb/ICPSR/studies/9274
下载链接
链接失效反馈官方服务：
资源简介：
This collection provides longitudinal data on geographic distances between nations. These distances changed over time as a result of alterations in the political map of Europe. The collection is designed to permit investigation of the variance in the degree of adjacency of nations and the measurement of economic and military spheres of influence. Each part of this collection presents a distance matrix for the time period involved, with dyadic distances between cities acting as national midpoints measured in 100 kilometers.
创建时间：
1990-01-01
