//-->
The Lake District, a century of conservation
Berry, Geoffrey, (1980)
Baikal as a world natural heritage site : results and prospects of international cooperation ; international conference ; Ulan-Ude, Russia, September 9 - 12, 1998; proceedings
Dobrecov, Nikolaj L., (1999)
Estimating willingness-to-pay with random valuation models : an application to Lake Sevan, Armenia
Laplante, BenoƮt, (2004)