The PDF version of "Genomes 4th Edition" by Terry Brown can be downloaded from various online sources, including:

The textbook follows a logical four-part organization that guides readers from technical fundamentals to complex evolutionary concepts:

"Genomes 4th Edition" by Terry Brown is a comprehensive textbook that provides an in-depth exploration of the structure, function, and evolution of genomes. The textbook has been widely adopted by students and researchers in the field of genomics and has become a standard reference in the field.

If you already own a hard copy, scanning it for personal use (a personal PDF backup) is generally considered fair use. Sharing that scan with classmates or via the web is not. Stick to the legal pathways.

in late 2017/early 2018, marks a significant update from its predecessor,