English: Tribou & Blackman Co. Concrete Stamp, 1913, Birch St. & 3rd St., Walla Walla, WA, USA. This appears to have been part of a project for which the company won a 1912 bid with the Walla Walla city government. See City of Walla Walla, Washington City Commission Chambers city clerk records from May 7, 1912.
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