I was given this book as a gift when I was a teenager and was inspired to start drawing immediately. I still use it all the time to get inspiration or to try a new technique.
It's great for beginners and for experienced artists. It features exercises, and explains techniques as well as providing some of the best work in pen and ink from a variety of fields. Here are a few examples:
This book will provide more than enough material for a strong and engaging unit on pen and ink drawing and rendering.
I hope you and/or your students get the chance to find inspiration from its pages!