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Want to contact Valve?
About the mods and the software developer's kit: sdk@valvesoftware.com
About Source Engine licensing: sourceengine@valvesoftware.com
About academic licensing: academiclicensing@valvesoftware.com
About the webmaster: webmaster@valvesoftware.com
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Postal Address:
PO Box 1688
Bellevue, WA 98009
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