Specifications and invitations. 3425. Earthwork and structures, laterals 1.7, 2.4, 4.3, 6.3, 9.2, 9.6, 10.4, 12.6, and 13.9, sublaterals and drains, Courtland lateral system, Superior Courtland unit. Bostwick division. Neb.-Kans., Missouri River Basin project.