Sound Insulation of Wall, Floor, and Door Constructions (open access)

Sound Insulation of Wall, Floor, and Door Constructions

From Abstract: "The data obtained at the National Bureau of Standards on the sound insulating properties of building structures are summarized. A brief description of the sound-measuring techniques is given."
Date: November 30, 1964
Creator: Berendt, Raymond D. & Winzer, George E.
System: The UNT Digital Library
Calculation of Sunrise and Sunset Times at Ionospheric Heights Along a Great Circle Path (open access)

Calculation of Sunrise and Sunset Times at Ionospheric Heights Along a Great Circle Path

Formulas, computer program, and illustrations for a great circle path at ionospheric heights.
Date: November 8, 1964
Creator: Brady, A. H. & Crombie, D. D.
System: The UNT Digital Library