Buy a used physical copy of the 5th or 6th edition. They are cheap and readily available. Then, scan your own personal PDF for portable study. This honors the legacy of Robert Shrader—a man who believed that electronic communication should be understood, not just used.
You can access digital versions of by Robert L. Shrader through various academic and digital library repositories. electronic communication robert shrader pdf
If you find the PDF useful, consider supporting the estate or publishers by purchasing a physical copy if you can find one. There is something satisfying about having a physical book on your workbench to flip through while soldering. Used copies of various editions (such as the 5th or 6th editions, which are very popular) are often available on sites like AbeBooks or eBay. Buy a used physical copy of the 5th or 6th edition