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| - General background information on water shut off with polyacrylamide and other polymers is seen in U.S. Pat. Nos. 5,125,456 and 5,957,203, both to Hutchins et al., U.S. Pat. No. 4,039,029 to Gall, U.S. Pat. No. 5,382,371 to Stahl et al., and U.S. Pat. No. 5,010,954 to Falk.
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