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http://www.salesforce.com/us/developer/docs/daas/salesforce_migration_guide.pdf
http://salesforce.stackexchange.com/questions/24095/how-to-do-data-migration-in-salesforce
https://developer.salesforce.com/page/Fifteen_Things_to_Consider_Before_Your_Next_Data_Migration
https://help.salesforce.com/apex/HTViewSolution?urlname=Best-Practices-for-Loading-Data-1327108675445&language=en_US