Marr, Yu. and Chaykin, K. Letters on Persian Literature (Pisma o persidskoy literature), 1976. In Russian.

Марр Ю. Н., Чайкин К. И.
Письма о персидской литературе.
Тбилиси : Издательство «Мецниереба», 1976.
302 с. : 1 л. портр. ; Энциклопедический формат. Твердый издательский переплет. Тираж 1 700 экз.
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Yuri Marr and Konstantin Chaykin.
Letters on Persian Literature.
Tbilisi : Metsniereba Publishing House, 1976.
302 pp. : 1 portr. ; Encyclopedic format. Hardcover. Edition of 1,700 copies. 

This 1976 volume is a scholarly treasure published by the Academy of Sciences of the Georgian SSR, documenting the intellectual dialogue between two giants of Soviet Iranian studies. The text provides a deep dive into the internal logic of Persian philology, including the arrangement of a decade-long correspondence between Yuri Nikolayevich Marr—a brilliant iranologist and son of the famous academician N. Ya. Marr—and Professor Konstantin Iosifovich Chaykin. Their letters transcend mere personal communication, forming a rigorous and vibrant exchange on the complexities of Persian classical poetry, the nuances of linguistic translation, and the evolving landscape of 20th-century Orientalist thought.
The collection offers more than technical analysis; it provides a lived, informal immersion into the world of Iranian culture, philosophy, and history as seen through the eyes of experts who dedicated their lives to the field. Covering topics from the rubaiyat of the masters to contemporary prose, the book serves as an invaluable primary source for the history of Soviet Oriental studies. Its physical identity is marked by a solid encyclopedic format and a dignified hardcover binding, reflecting the academic prestige of the Metsniereba press. With a limited print run of only 1,700 copies, this Tbilisi-published work is a significant find for bibliophiles, iranologists, and collectors of academic correspondence. It stands as a testament to a golden age of Georgian-based Orientalist research and the deep cultural ties between the Caucasus and the Persian-speaking world.