Military Cryptanalysis: Part III Simpler Varieties of Aperiodic Substitution Systems. Friedman, W. F. United States Government Printing Office, Washington, DC, 1939. 00000
bibtex   
@book{friedman_military_1939,
	address = {Washington, DC},
	title = {Military {Cryptanalysis}: {Part} {III} {Simpler} {Varieties} of {Aperiodic} {Substitution} {Systems}},
	copyright = {Declassified and approved for release by NSA on 09-19-2005},
	publisher = {United States Government Printing Office},
	author = {Friedman, William F.},
	year = {1939},
	note = {00000},
	keywords = {cryptanalysis}
}

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