Sound and music: an elementary treatise on the physical constitution of musical sounds and harmony, including the chief acoustical discoveries of Professor Helmholtz.

Mode of access: Internet.

Acoustical and emission characteristics of small, high-speed internal combustion engines. Final report.

National Highway Traffic Safety Administration, Office of Research and Development, Washington, D.C.

Development of criteria and test methods for eye and face protective devices /

Mode of access: Internet.

Methods and devices for the professional improvement of teachers of vocational agriculture; summary of a study of the professional improvement of teachers of vocational agriculture of the southern region

Mode of access: Internet.

Mass-rule government, and why is a new constitution inperative? The principles, devices, education, and organization required to give to the qualified citizens the supreme power over their government,

Mode of access: Internet.

Splash and spray suppression: technological developments in the design and testing of spray reduction devices for heavy trucks. Report to Congress.

Mode of access: Internet.

Optimal application and placement of roadside reflective devices for curves on two-lane rural highways. Final report.

Ohio Department of Transportation, Columbus

Performance requirements for doors, door retaining devices and adjacent structures.

National Highway Safety Bureau, Washington, D.C.