Currently the following sources are available:

Muscovy, Pre-Petrine Russia
    Samuel Collins:  "On the Present State of Russia."

Peter the Great
    Proclamation on the Introduction of the New Calendar, 1700
    Decree on Single Inheritance 
    Pavel Miliukov on the Reforms of Peter the Great

Eighteenth Century Russia
    The "Conditions" of Anna Ivanovna's Accession to the Throne
    Peter III's Manifesto Freeing Nobles from Obligatory Service
    The Pugachev Rebellion
    Catherine the Great's Instruction to the Legislative Commission
    Alexander Radishchev, Journey from St. Petersburg to Moscow

Nineteenth Century Russia
    Petr Chaadaev, First Philosophical Letter
    Vissarion Belinsky, Letter to Gogol
    Alexander II, Emancipation Manifesto, February 19, 1861
    Alexander Nikitenko responds to the Emancipation Manifesto
    A. V. Iartsev, Proclamation of a Populist Activist, 1874
    Alexander III, Manifesto of April 29, 1881
    Konstantin Pobedonostsev, Reflections of a Russian Statesman
    Sources on Mixed Marriage (courtesy of Paul Werth)