Bi-State Program, Section 2.3 Backwater Reconnaissance Survey. Reconnaissance Report Vol. 2.

Tetra Tech. December 1993. Lower Columbia River backwater reconnaissance survey. Reconnaissance report. Volume 2: Data validation reports. Prepared for Lower Columbia River Bi-State Committee. Tetra Tech, Inc., Redmond, WA. (TC 9497-06).

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Tetra-Tech Inc.