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Title	World maps of F2 critical frequencies and maximum usable frequency factors / Donald H. Zacharisen.
Format	online resource
Internet Access	https://purl.fdlp.gov/GPO/gpo46466
Author	Zacharisen, D. H. (Donald H.), author.
Published	Washington, D.C. : National Bureau of Standards, United States Department of Commerce, Office of Technical Services, 1959.

SuDoc Number	C 13.46:2
Item Number	0249-A (online)
Description	1 online resource (244 pages) : chiefly illustrations, maps.
Content Type	text
Series	(NBS technical note ; 2.)
General Note	Title from title screen (viewed Mar. 5, 2014).
	"April 1959."
	"Prepared in response to Study Program 60 and Recommendation 176 of the International Radio Consultative Committee (CCIR)."
Bibliography	Includes bibliographical references (page 10).
Subject - LC	Ionospheric radio wave propagation -- Charts, diagrams, etc.
	F region -- Charts, diagrams, etc.
Added Entry	United States. National Bureau of Standards, issuing body.
Linking Field	Print version: Zacharisen, D. H. (Donald H.). World maps of F2 critical frequencies and maximum usable frequency factors (OCoLC)6358851
URL	http://www.gpo.gov/fdsys/pkg/GOVPUB-C13-10f2ab3c92437fcf74f7e29dc68056ea/pdf/GOVPUB-C13-10f2ab3c92437fcf74f7e29dc68056ea.pdf

Holdings	All items

OCLC Number	(OCoLC)727567278
CGP Record Link	https://catalog.gpo.gov:443/F/?func=direct&doc_number=000921275&local_base=GPO01PUB
System Number	000921275