"§ 15.217 Operation in the band 160–190 kHz (47 CFR 15.217)". Part 15 — Radio frequency devices. ecfr.gov (Report). The Electronic Code of Federal Regulations. 47 CFR 15.217 (47 CFR 15.206). Retrieved 17 March 2024.[failed verification] Cited section 47 CFR 15.206 not present / removed: section id §15.205 skips to §15.207 .
"Very Low Frequency (VLF)". United States Nuclear Forces. fas.org. 1998. Archived from the original on 27 December 2007. Retrieved 9 January 2008.
itu.int
Final Acts WRC-15(PDF). World Radiocommunication Conference. Geneva, Switzerland: International Telecommunications Union. 2015. p. 4. Retrieved 12 January 2025.
ndblist.info
Gale, Alan (G4TMV) (2011). World DGPS database for DXers(PDF) (Report). 4.6. Archived from the original(PDF) on 21 July 2011. Retrieved 14 January 2008 – via ndblist.info.{{cite report}}: CS1 maint: numeric names: authors list (link)
Gale, Alan (G4TMV) (2011). World DGPS database for DXers(PDF) (Report). 4.6. Archived from the original(PDF) on 21 July 2011. Retrieved 14 January 2008 – via ndblist.info.{{cite report}}: CS1 maint: numeric names: authors list (link)
wireless.org.uk
"QSO ZL / UA0 on 136 kHz". The World of LF. wireless.org.uk. Archived from the original on 29 September 2007. Retrieved 1 June 2006.