In a physical textbook, finding "brachial plexus" takes 30 seconds. In a PDF, it takes 0.5 seconds.

Snell Clinical Anatomy By Regions 9th Ed 20121 - sciphilconf.berkeley.edu

The legitimate 11th edition often comes with an access code for the digital companion website. Alternatively, renting the eBook via Amazon Kindle or VitalSource allows you to "work" the PDF features legally, with highlighting, search, and cloud saving.