Human resources development
1967
Economics of alternative coal transportation and distribution systems in Iowa
1978
The economics of reducing the county road system
1986
The Iowa grain flow survey
2001
Projected quantities of grain and fertilizer requiring transportation services in Iowa in 1979-80 and 1984-85, by counties
1974
The Local rural road system
1989
Impact of inland waterway user charges on corn, wheat and soybean flows
1982
An economic analysis of alternative grain transportation systems
1973
