A detailed booklet that describes symptoms, causes, and treatments, with information on getting help and coping.
It is available in pdf format, there is a printer-friendly option or you can read it online.
It is simply called Depression and the sections include:
What is a Depressive Disorder?
Types of Depression
Symptoms of Depression and Mania
Causes of Depression
Diagnostic Evaluation and Treatment
How to Help Yourself If You Are Depressed
Where to Get Help