Numerical maps of foEs for solar cycle minimum and maximum
By: M. Leftin, S.M. Ostrow, and C. Preston
Contributors: Ostrow, S. M.; Preston, C.; Institute for Telecommunication Sciences; United States. Environmental Science Services Administration. Research Laboratories
Series: ESSA technical report -- ERL 74-ITS 63
Publisher: Institute for Telecommunication Sciences
Published: 1968
Place of publication: Boulder, Colo
Language: eng
Number of pages: 89
Subjects: Ionospheric radio wave propagation; Charts, diagrams; Ionosphere; Maximum usable frequency (Radio); Sporadic E (Ionosphere); Solar cycle
Notes: At head of title: U.S. Department of Commerce, Environmental Science Services Administration, ESSA Research Laboratories.

"May 1968."

Includes bibliographical references (p. 15-16).