Trends in federal transportation financial activity, fiscal years 1970-1979 : report number 2, modal distribution of federal transportation obligations and outlays /

"April 1980."

Trends in federal transportation financial activity, fiscal years 1970-1979 : report number 3 : projections of federal transportation obligations, 1980-1989 (based on 1970-1979 historical patterns) /

"DOT-P-10-80-22"--Cover.