Specifications and invitations. 4163. [Earthwork and structures, Courtland Canal, station 1503 + 00 to station 1581 + 00, laterals and drains, and check structure at station 1492 + 50, North Canal and laterals, Ridge Canal and laterals, Bostwick division, Neb.-Kans., Missouri River Basin project]; supplemental notice 2.

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