pg. 80 — Pushkin’s The Peasant Mistress or The Belkin Tales
"The Peasant Mistress," also known in English as "The Squire's Daughter," was written by Russian author Aleksandr Pushkin in 1831. The Belkin Tales are a series of five short stories and also includes a fictional editorial introduction. The five tales are not related to each other, but are all said in the introduction to be told to a recently deceased landowner, Ivan Petrovich Belkin. It is mentioned how Belkin was an interesting and mysterious person and that his favorite pastime was collecting stories. The different tales are titled "The Shot," "The Blizzard," "The Undertaker," "The Station Master," and "The Squire's Daughter." 

pg. 81 — tet-a-tetes
Tête-à-tête literally means head-to-head in French. Normally this is meant to mean an intimate, private conversation between two people. 

pg. 83 — Likhobory
Likhobory is a suburb in Moscow, Russia that sits between the inner and outer rings of the city. 

pg. 83 — Preobrazhensky Market
This is a market at Preobrazhensky Val Street in Moscow, Russia. 

pg. 84 — Wallenstein 
Wallenstein is the title commonly given to Friedrich Schiller's trilogy of dramas. The trilogy contains the plays: Wallenstein's Camp, The Piccolomini, and Wallenstein's Death. The trilogy is also split into to parts, with the first two plays forming the first part and the last play forming the second part. The trilogy was completed in 1799 in Germany. The drama centers around the famous general Albrecht von Wallenstein and is based loosely on the events of the Thirty Year's War. Wallenstein ends up failing at the hight of his power when he begins to rebel against his emperor, Ferdinand II. In the end, Wallenstein fled Germany and was assassinated in 1634. The primary significance of this work to Sonechka is that it displays Sonechka's love of literature and intelligence.