Original bridge plans and construction drafts. Four different bridge types are represented: Strauss direct lift bridge, Strauss trunnion draw span, Strauss trunnion bascule bridge, and Strauss vertical lift bridge.
This polygon shapefile represents areas that were the subject of interstate territorial disputes between 1947 and 2000. The disputed areas referenced in this map were identified in 'The Democratic Peace and Territorial Conflict in the Twentieth Century' (Huth and Allee, 2002.) Each disputed region is rendered as a polygon encompassing the area of overlapping claims. Each region has a variable 'homeland,' indicating whether the area was ever part of a dispute involving homeland territory for both states. Each dispute is also assigned a precision code, from 1 to 5, where 1 represents the highest level of certainty and 5 represents the lowest level. The vast majority of claims represented in this dataset were bounded with relatively high precision. Research related to these data is described in 'Mapping Interstate Territorial Conflict: A New Data Set and Application.' An earlier version of this shapefile and other related information including annual data for dyads and direct dyads involved in disputes, as well as a file of the territorial disputes identified by Huth and Allee, can be found at: http://purl.stanford.edu/zc000fq4044.