"PSS. Volume 66. Letters, 1891 (July-December) — 1893" is an important part of the authorized collection of works of the outstanding Ukrainian writer Lesya Ukrainka. This volume contains letters written by Lesya Ukrainka in the period from July 1891 to December 1893. In these letters, the author shares her thoughts, feelings, plans, reflections on literary creativity and life in general. The reader will have the opportunity to better understand the inner world of the outstanding writer, her preferences, motivations and urges for creativity. This book is a valuable source for those interested in the literary process, the biography of Lesya Ukrainka, and the general history of Ukrainian literature of the 19th century.