K8ND SO2R Resources 
Summary and great pictures of many SO2R configurations and stations 
http://www.k8nd.com/Radio/SO2R/K8ND_SO2R.htm

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SO2R from CT1BOH 
Simple SO2R Explanations via CT1BOH 
http://www.qsl.net/ct1boh/so2r.htm

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SO2R via Wikipedia 
Wikipedia section re SO2R Operations 
http://en.wikipedia.org/wiki/SO2R

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Simple SO2R 
ZS6AA .pdf regarding setting up a simple SO2R station 
http://zs6aa.files.wordpress.com/2008/02/a-simple-so2r-contest-station.pdf

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N7IR on Single-Op, Two Radio (SO2R) Operations 
N7IR's excellent Power Point presentation on SO2R 

https://www.dropbox.com/s/6nknvlsgsv9g6bu/Single-opTwoRadio.ppt?dl=0