Welsh Historical Review is published by the University of Wales Press
It's address is 6 Gwennyth Street, Cathays, Cardiff, CF2 4YD
(phone) 01-222-231919 or (FAX) 01-222-230908
The listed price for WHR is 5 pounds. I believe that is per issue.
So it would be maybe $8.50 per in USA (? $34.00)