The book is widely available through academic platforms and retailers. You can find legitimate digital or physical copies at: B.Sc. Physics Course Material
Some scanned versions of old editions (e.g., 1985, 1992) have missing appendices or low-resolution scans. One such corrupted metadata or a badly OCR’ed PDF list “671” as page count – but the real book (even 1st edition) has more pages. The book is widely available through academic platforms