: Add filetype:pdf or filetype:epub to narrow results to your preferred reading format.
(pdf|epub|mobi) : Searches for all major eBook formats simultaneously. 2. High-Quality Academic & Scholarly Indexes index of ebooks high quality
: A massive partnership of research institutions offering millions of digitized titles from libraries worldwide. : Add filetype:pdf or filetype:epub to narrow results
If you are looking for classics or professionally formatted public domain works, these sources are known for "high quality" in terms of metadata and layout. Directory of Open Access Books High-Quality Academic & Scholarly Indexes : A massive
-inurl:(html|php) : Filters out standard webpages to ensure you only see actual file lists.
: Use intitle:"index of" "ebooks" to find servers with directory listing enabled.
: A powerful combination for high-quality results is: intitle:"index of" (pdf|epub|mobi) -inurl:(html|php) "subject or author name" intitle:"index of" : Targets the directory listing title.