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- http://www.aprs.org/doc/APRS101.PDF [[File:APRS101.PDF]]251 bytes (43 words) - 02:19, 22 October 2014
- ...01.PDF Alternatively, a local copy is hosted on this site as well: [[File:APRS101.PDF]]3 KB (521 words) - 02:59, 5 January 2015