Columbia:
http://columbiasheep.org/
http://www.ansi.okstate.edu/breeds/sheep/columbia/index.htm
 

East Friesian:
http://www.ansi.okstate.edu/breeds/sheep/friesianmilk/index.htm
http://www.asas.org/JAS/symposia/proceedings/0908.pdf
http://www.asas.org/jas/jas0913.pdf
 

Romanov:
http://home.columbus.rr.com/narsa/
http://www.ansi.okstate.edu/breeds/sheep/romanov/
http://www.sheep101.info/breeds.html
 

Polypays:
http://www.ansi.okstate.edu/breeds/sheep/polypay/index.htm
http://www.countrylovin.com/polypay/index.html