Mongolian People’s Revolutionary Party Archive

Website: n/a

However, try Sergey Radchenko's own website http://mongolhistory.radchenko.net/ for samples of documents and http://www.radchenko.net/campaign.shtm for more information on the Mongolian archives. 

Also, see Chris Kaplonski's website, http://www.chriskaplonski.com for samples of documents in the Mongolian script.