http://nemadojo.com/index.html  NEMA Dojo North Eastern Martial Arts, Rochester, NY.  Also HQ for SKTA

http://www.kineticedgeperformance.com/   Kinetic Edge Performance, Owner Brad Nelson, Senior RKC

http://www.ateruworldwideassociation.com/    Ateru World Wide Association, Owner and Chief Instructor Sensei Kevin Cullen, Advisor SKTA

http://www.wolfpakmartialarts.com/  Wolfpak Martial Arts Training Studio, Chief Instructor Sam Wolf

http://dragondoor.com/?apid=OKC    The home of RKC kettlebell info, Dragon Door, Owner John DuCane, Chief Instructor Pavel Tsatsouline.   

http://www.dragondoor.com/kettlebells/?apid=OKC 
Go here for anything dragon door, kettlebells, books and dvds'.  Also an excellent description of kettlebell training and benefits.