2015 Shortwave frequency guide : worldwide broadcast and utility radio stations / ed. Klingenfuss Publications
The 2015 super frequency list : broadcast and utility / ed. Klingenfuss Publications
Radio data code manual : worldwide HF communication today
2018 Super frequency list : broadcast and utility / ed. Klingenfuss Publications
2017/2018 Guide to utility radio stations : professional HF communication today / ed. Klingenfuss Publications
2018 Shortwave frequency guide : worldwide broadcast and utility radio stations / ed. Klingenfuss Publications