Potential means of cost reduction in grade crossing automatic gate systems. Volume I: overview and low cost railroad/highway grade crossing gate systems. Final report.

Transportation Systems Center, Cambridge, Mass.

Potential means of cost reduction in grade crossing automatic gate systems. Volume II: improved gate arm concepts for railroad/highway grade crossings. Final report.

Transportation Systems Center, Cambridge, Mass.

Improvement of the effectiveness of motorist warnings at railroad highway grade crossings. Final report.

Federal Railroad Administration, Office of Research and Development, Washington, D.C.

Potential means of cost reduction in grade crossings motorist-warning control equipment. Volume II: comparison of solid state and relay devices and techniques. Final report.

Transportation Systems Center, Cambridge, Mass.

A study of state programs for rail-highway grade crossing improvements. Final report.

Federal Railroad Administration, Office of Policy and Program Development, Washington, D.C.

Innovative concepts and technology for railroad-highway grade crossing motorist warning systems. Vol. I: overview and concept generation and analysis. Final report.

Transportation Systems Center, Cambridge, Mass.

Innovative concepts and technology for railroad-highway grade crossing motorist warning systems. Vol. II: the generation and analysis of alternative concepts. Final report.

Transportation Systems Center, Cambridge, Mass.

Safety features of stop signs at rail-highway grade crossings. Volume I. Executive summary. Final report.

Federal Highway Administration, Offices of Research and Development, Washington, D.C.

Potential means of cost reduction in grade crossings motorist-warning control equipment. Volume I: overview, technology survey and relay alternatives. Final report.

Transportation Systems Center, Cambridge, Mass.

An analysis of expected delay reduction by replacing a congested at-grade intersection with an interchange.

Texas Department of Transportation, Austin

Definition and use of the phi grade scale /

"November 1979."

Physical beneficiation of low-grade uranium ores,

"July 30, 1958."

Alignment and grade of culverts. Part I. Determination of required size, alignment and grade of culverts.

Mode of access: Internet.

Lower-grade English, grammar, analysis, punctuation, paraphrasing, derivation...

Mode of access: Internet.

Harvey's English grammar. A practical grammar of the English language, for the use of every grade.

Mode of access: Internet.