When searching for primary sources on your topic, it is best to begin with a search for secondary sources. Look in the bibliographies of the secondary sources to see which primary sources were consulted in the writing of the secondary source.
Search CLICsearch to find to locate collections of primary sources.
"Russian history AND sources"
"Russian history AND documents"
When you find a relevant source, click on the subject heading in CLICsearch to find more items on the subject.
Here are some example subject headings for primary sources in Russian history:
Russia -- History -- Sources
Soviet Union - History - Revolution, 1917-1921 - Sources
Russia -- History -- Nicholas II, 1894-1917 -- Sources