Automatic safety belt systems: changes in owner usage over time in GM Chevettes and VW Rabbits. Final report.

National Highway Traffic Safety Administration, Washington, D.C.

Variations in skid resistance over time. Part 1. Final report.

Virginia Department of Highways and Transportation, Richmond

Specification of patterns over time in Chicago homicide : increases and decreases, 1965-1981 /

"October 1985."