710Ba5123: "N.A. Christensen's steel forms for casting conc[rete] ditches". Finished concrete ditch, man kneeling in field in distance
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Accompanying note reads, "Pictures of use of in casting experimental sections E. end Hydr. Lab by Herb Schweizer. In 1952, these sections were destroyed when East addition to Lab. was built. Data in Code's files. Civil Eng. Dept"