“Reasons for Anti-Semitism”. Mark Vaintrob (1895-1941, Riga) – assistant professor at Moscow University, founder of courses at Riga Russian University (1921).
On the title page of the book, the author is dedicated to Konstantin Arabazhin. – handwriting, ink, in Russian, 19.03.1927 Konstantin Arabazhin (1865-1929, Riga) – well-known specialist in Russian literature, well-known Russian scientist, public figure, professor. Lived in Riga since 1920, gave lectures in Riga educational institutions, incl. Russian University courses and the Jewish Conservatory.