Request for PDF: Biological Science by R. Soper

Any guidance on locating this specific text (full title and ISBN would be very helpful, if known) would be greatly appreciated.

Thank you for your time.

I am trying to locate a digital copy (PDF) of the textbook Biological Science by R. Soper. I understand this is a well-regarded introductory text, particularly for foundational biology courses, but I have been unable to find a legitimate PDF version through standard search engines.