Soccer - very good stuff

 http://thethistlearchive.wikidot.com/johnny-ballantyne

https://web.archive.org/web/20090302062039/http://www.sover.net/~spectrum/index.html

https://web.archive.org/web/20090309035124/http://www.sover.net/~spectrum/philadelphia.html

https://web.archive.org/web/20090716184015/http://www.sover.net/~spectrum/growth.html

https://web.archive.org/web/20090305081558/http://www.rsssf.com/

https://web.archive.org/web/20090224080635/http://geocities.com/br1anmccoll/

http://bethlehemsteelsoccer.org/

http://bethlehemsteelsoccer.org/photo.html

https://web.archive.org/web/20151222111001/http://www.derbytelegraph.co.uk/Bygones-Tracing-massive-rise-footballers-wages/story-26606709-detail/story.html