Computer Analysis of Twin Box Culverts, 1959

The paper presents a method of analyzing Rigid Frames by use of the Conjugate Beam Theory. The development of the method along with an example is given. This method has been used to write a computer program for the analysis of twin box culverts. The culverts may be analyzed under any fill height and any of the standard truck loadings. The wall and slab thickness are increased by the computer program as necessary. The final result is steel requirements both for moment and shear, and the slab and wall thickness.

Role of habitat in the distribution and abundance of marsh birds, 1965

This is Special Report no. 43 that studies habitat changes and the affects on marsh birds. It covers the history of vegetation and birds of two marshes, Little Wall and Goose Lake, in Iowa for a 5-year period beginning in 1958 at the culmination of a series of drought years in central Iowa.