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S. FRIES, A Chronological Bibliography of Latgalian Printed Texts from the 18th to Early 20th Centuries. Rēzekne, Latvia: Rēzeknes Tehnoloģiju akadēmija, 2023. Accessed: Oct. 08, 2024. [Online]. Available: https://books.rta.lv/index.php/RTA/catalog/book/28