Indoor rowing (search1, search2)

Row Perfect - - causes ~6x less load for knees than Concept2. There is also research behind the technology and therefore has much more professional approach than others.
Concept2 -

Outdoor rowing

Rowing Club "Pärnu" -
other rowing clubs in Estonia
Estonian Rowing Association

I was member of Estonian national rowing team 1990-1995.
Also in 1985-1995 I was active athlete of academic rowing in Pärnu, Estonia