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I'm presuming this is the same "scientist and professor" mentioned in "Pereleshin, Mount". BC Geographical Names., which I've used as a link in Mount Pereleshin. I've seen more on Blake's journey with Pereleshin elsewhere but can't remmember the citation; it seems he was on his way back from Japan when this journey up the river in the company of Lieut. Pereleshin was made; see the report to Seward cited on the Mt Pereleshin page. Skookum1 ( talk) 21:59, 5 May 2010 (UTC) reply

Reasonably certain now - see Talk:Mount Pereleshin and note in formation in translated Russian source, some of which can be added to this article. If it's the same guy; but it would seem to be... Skookum1 ( talk) 23:02, 5 May 2010 (UTC) reply