Levine's /Linkers and Loaders/ is a great book, but it's still in print, and this is an unauthorized copy.

The author's home page (https://www.iecc.com/linker/) used to host a PostScript version for download, but it no longer does, now saying: "Chapters were available in an excessive variety of formats, but are not any longer due to chronic piracy."

These days there is lots of information about linkers and loaders to be had without violating Levine's copyright; see https://www.toolchains.net/ for many links.