- Author: ARRL Inc Doug Grant K1DG
- Language: English
- Year: 2020
- Author: Wes H. Hayward
- Language: English
- Year: 1995
- Author: Ward Silver Mark Wilson (editor)
- Language: English
- Year: 2008
- Author: AMER RADIO RELAY LEAGUE.
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- Year: 2012
- Author: Eric Nichols
- Language: English
- Year: 2013
- Author: Leigh L. Klotz Jr WASZNU
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- Year: 2013
- Author: Steve Ford
- Language: English
- Year: 2005