Open the EPUB in a reader (like Calibre) to see the "Title" and "Author" fields, which often differ from the filename.
Many digital libraries or internal document management systems (like those used in government or corporate archives) assign randomized or coded strings as filenames during bulk exports or data collection . EADC-XG.epub
Where the file was downloaded from (e.g., a specific university portal, a mirror site like Anna’s Archive, or a legal database) is the best indicator of its subject matter. Open the EPUB in a reader (like Calibre)
If you suspect it is a technical report or a historical monograph (similar to those from the U.S. Army Center of Military History ), the internal text will usually contain a formal title page. a specific university portal