2006 Super frequency list : broadcast + utility radio stations / ed. Klingenfuss Publications
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
CD recordings of modulation types : set 1 and set 2 / ed. Klingenfuss Publications
Radio data code manual : worldwide HF communication today / ed. Klingenfuss Publications