[Remarkable Primary Source on 17th Century Russian-Western European Relations] Relatione d’Alcuni Costumi de’Sig.i Ambasc. Moscoviti, che ora si trovano in Livorno per passare all’Ambasciata di Venezia [Autograph Letter by an Anonymous Author from Livorno Witnessing the Muscovite Embassy to Venice (1656-1657) and Containing Vivid Observations and Remarks About Russians]. Livorno, ca. 1656.