NOTICE

Oct R L Alpert
M K Mathews
A T Modak Dot-fana
R. L. Alpert
M. K. Mathews
A. T. Modak
U. S. Department
Of Transportation

Publication date

January 1981

Abstract

This document is disseminated under the sponsorship of the Department of Transportation in the interest of information exchange. The United States Government assumes no liability for the contents or use thereof. The United States Government does not endorse products or manufacturers. Trade or manufacturer's names appear herein solely because they are considered essential to the object of this report