FRIES, S. (2023) A Chronological Bibliography of Latgalian Printed Texts from the 18th to Early 20th Centuries. Rēzekne, Latvia: RTU Rēzeknes akadēmija. Available at: https://books.rta.lv/index.php/RTA/catalog/book/28 (Accessed: 2 April 2025).