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These data sets identify states, their standard Correlates of War \"country code\" or state number (used throughout the Correlates of War project data sets), state abbreviations, and dates of membership as states and major powers in the internationaly system. Version 2004.1 extends the temporal domain of the collection to 2004. Users note: The order of variables in this file has changed from the 2002 version. The variables were incorrectly ordered in the 2002 version of this data set, and did not match the documentation (the first two variables were switched). In the 2004 version, variables are now in the correct order, and are identical between the \"states\" and \"majors\" data sets.\n<br /><br />\r \r <b>We ask users of the data set to cite this data set as follows:</b><br />\r \r     Correlates of War Project. 2005. “State System Membership List, v2004.1.” Online, http://correlatesofwar.org."}}]},{"typeName":"notesText","multiple":false,"typeClass":"primitive","value":"Subject: STANDARD DEPOSIT TERMS 1.0  Type: DATAPASS:TERMS:STANDARD:1.0  Notes: This study was deposited under the of the Data-PASS standard deposit terms. A copy of the usage agreement is included in the file section of this study.;"},{"typeName":"producer","multiple":true,"typeClass":"compound","value":[{"producerName":{"typeName":"producerName","multiple":false,"typeClass":"primitive","value":"Paul F. Diehl (Director)"},"producerAffiliation":{"typeName":"producerAffiliation","multiple":false,"typeClass":"primitive","value":"University of Illinois, Urbana-Champaign"},"producerURL":{"typeName":"producerURL","multiple":false,"typeClass":"primitive","value":"http://www.pol.uiuc.edu/people/faculty/members/diehl.html"}},{"producerName":{"typeName":"producerName","multiple":false,"typeClass":"primitive","value":"Scott Bennett (Associate Director)"},"producerAffiliation":{"typeName":"producerAffiliation","multiple":false,"typeClass":"primitive","value":"Pennsylvania State University"}}]},{"typeName":"distributor","multiple":true,"typeClass":"compound","value":[{"distributorName":{"typeName":"distributorName","multiple":false,"typeClass":"primitive","value":"Murray Research Archive"},"distributorURL":{"typeName":"distributorURL","multiple":false,"typeClass":"primitive","value":"http://www.murray.harvard.edu"},"distributorLogoURL":{"typeName":"distributorLogoURL","multiple":false,"typeClass":"primitive","value":"http://murray.harvard.edu/files/murray/banner146x48.png"}}]},{"typeName":"distributionDate","multiple":false,"typeClass":"primitive","value":"2005"},{"typeName":"dateOfDeposit","multiple":false,"typeClass":"primitive","value":"2007"},{"typeName":"relatedMaterial","multiple":true,"typeClass":"primitive","value":["<a href=\"http://www.correlatesofwar.org/\"  target= \"_new\"> related material available here</a>"]}]}},"files":[{"description":"This file contains a list of the COW major powers and their qualifying periods of tenure. 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