共 19 条
[1]
HIRST E, UNPUBLISHED REPORT
[2]
PAGE LW, 1910, ENGINEERING RECORD
[3]
VOORHEES AM, 1962, 41 ANN M HIGHW RES B
[4]
1963, 42 ANN M HIGHW RES B
[5]
1971, ACCIDENT FACTS, P3
[6]
1967, AUTOMOBILE AIR POL 2, P18
[7]
1970, 191 US DEP AGR AGR E
[8]
1969, 105 HIGHW RES BOARD, P117
[9]
1970, 1 COUNC ENV QUAL ANN, P194
[10]
1969, 277 HIGHW RES REC HI, P7