You can find several volumes of Marija Jurić Zagorka's historical novel (also known as Gordana: Kraljica Hrvata
Under the (and by extension, Croatian law), copyright typically lasts for the life of the author plus 70 years after their death. Marija Jurić Zagorka died in 1957 .
This method is 100% legal, supports the preservation of Zagorka’s legacy, and gives you a high-quality, searchable PDF.
These are frequently available as legal e-books and, once purchased, can be converted to PDF using the same method described above.