N Humphrey

EXPANDING METROPOLITAN HIGHWAYS: IMPLICATIONS FOR AIR QUALITY AND ENERGY USE

N Humphrey, N. Humphrey, 1996 .

PROTECTING PUBLIC SAFETY NEAR PIPELINES

N Humphrey, 1989 .

LETTER REPORT - COMMITTEE TO REVIEW FEDERAL ESTIMATES OF THE RELATIONSHIP OF VEHICLE WEIGHT TO FATALITY AND INJURY RISK

N Humphrey, D W North, 1996 .