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Blueprints are used to build items. While some are found, others (like the Molotov plans) are purchased from vendors.
If you wish to add a blueprint you found, copy the mark-up code in the gray box on the Template:Blueprint and just drop in the information. For blueprints that are purchased, just mention the vendor and his or her location in the description.
Don't forget to add the blueprint's location on the Interactive Map!