http://cdn1.hubspot.com/hub/53/archive/docs/connecting-qr-codes-with-consumers.pdf
http://cdn2.hubspot.net/hub/53/file-27736249-pdf/thirdparty/marketingsherpa-top-5-mobile-marketing-case-studies–how-tos.pdf?t=1365222678000
http://cdn2.hubspot.net/hub/53/file-13206040-pdf/docs/marketing_automation_ten_commandments_final.pdf
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