2006 Shortwave frequency guide : worldwide broadcast and utility radio stations / ed. Klingenfuss Publications
2005/2006 Guide utility radio stations : worldwide HF communication today / ed. Klingenfuss Publications
2009 Shortwave frequency guide : worldwide broadcast and utility radio stations / ed. Klingenfuss Publications
2009/2010 Guide utility radio stations : worldwide HF communication today / ed. Klingenfuss Publications