Youth in trouble /

Mode of access: Internet.

Annual report for the fiscal year ending Apr. 15th.

Mode of access: Internet.

The Pacific railroads : suggestions submitted to the Hon. Charles Devens, attorney-general of the United States, on the resolutions of the Senate and House of Representatives in respect to the operation of the Union Pacific Railroad and branches : on behalf of said railroad company /

Mode of access: Internet.

Examples of project-problem instruction.

Mode of access: Internet.

Biennial report.

Reports for 1918/20-1924/26 not published.

Guidelines for the application of arrow boards in work zones. Final report.

Federal Highway Administration, Office of Research, Washington, D.C.

Harry S. Truman Dam Spillway and Powerhouse, Osage River, Missouri. hydraulic model investigation /

Cover title.

Effects of taper length on traffic operations in construction zones.

Federal Highway Administration, Office of Research, Washington, D.C.

Photovoltaic research branch semiannual report : period covered : 1 October 1979 to 31 March 1980 /

This report covers SERI research activities on solid-state theory, high-efficiency cells, thin-film cells, silicon purification, silicon crystallization, thick-film technology, surface and interface analysis, and growth of GaAs and related compounds by metal-organic chemical vapor desposition.

Photoelectronic properties of zinc phosphide crystals, films and heterojunctions : quarterly progress report no. 6 for the period July 1 - September 30, 1980 /

The purpose of this research program is to investigate the photoelectronic properties of zinc phosphide (Zn₃P₂ in single crystal form, in thin-film form, and in heterojunctions in which Zn₃P₂ forms one of the elements. This research will be directed toward understanding the role of crystalline defects and impurities in Zn₃P₂, the nature of the electronic charge transport in single crystal and thin-film material, and the properties of photovoltaic heterojunctions involving Zn₃P₂. The scope of the program extends from basic investigations of materials properties on single crystals to the preparation and characterization of all-thin-film heterojunction divices. One of the principal motivations behind this research program is the realization that Zn₃P₂ is a relatively uninvestigated yet ideal component for photovoltaic heterojunction use in solar energy conversion. The proposed program will concentrate on the basic materials problems involved with Zn₃P₂, providing the kind of information needed for other more developmental programs directed toward actual practical cells.

Advanced photovoltaic concentrator cells : quarterly technical progress report no. 5 for period September 1 - November 30, 1980 /

"Work Performed Under Contract No. AC02-77CH00178."

Materials for high efficiency monolithic multigap concentrator solar cells : SERI quarterly report no. 4, January 1 - March 31, 1980.

"Work Performed Under Contract No. AC02-77CH00178."

Commercialization of a thick film solar cell : quarterly technical progress report for April 1 - June 30, 1980 /

"Work Performed Under Contract No. AC02-77CH00178."

Commercialization of a thick film solar cell : quarterly technical progress report for period September 1 - October 1, 1980 /

"Work Performed Under Contract No. AC02-77CH00178."

Low-cost sprayed CdTe solar-cell research : third quarterly progress report for period February 15 - May 14, 1980 /

"Work Performed Under Contract No. AC02-77CH00178."