Elevated duct data-based improvement
By: E.J. Dutton ... [et al.]
Contributors: United States. National Telecommunications and Information Administration
Series: NTIA report -- 81-89
Publisher: U.S. Dept. of Commerce, National Telecommunications and Information Administration
Published: 1981
Place of publication: [Washington, D.C.?]
Language: eng
Number of pages: 46
Subjects: Radiosondes; Shortwave radio
Notes: "Report series"--Cover

"December 1981."

Bibliography: p. 35