"Pushkin and his contemporaries. Materials and research. Issue IV." Here are the basic information: Title: "Pushkin and his contemporaries. Materials and research." Issue: IV. Publisher: Published by the commission for the publication of Pushkin's works at the Department of Russian Language and Literature of the Imperial Academy of Sciences. City of publication: St. Petersburg. Year of publication: 1906. Printing house: Imperial Academy of Sciences, Vas. Island, 9 line, No 12. Series “Pushkin and his contemporaries: materials and research” was published from 1903 to 1930 by the Commission for the publication of works. Pushkin at the Department of Russian Language and Literature of the Imperial Academy of Sciences. In total, 30 issues were released, each of which contained research, archival documents and materials devoted to the life and work of Alexander Pushkin and his entourage. Issue IV, published in 1906, is part of this series. Unfortunately, the exact content of this issue is not specified in the available sources. However, given the general orientation of the series, it can be assumed that it presents research on both Pushkin himself and his contemporaries, as well as the publication of archival materials, letters and documents related to the Pushkin era.