All of Elmer Keith's books and all of Jeff Cooper's writings. Mas Ayoob's books. Ed McGivern's book will blow your mind. And books ARE better.
You really need to narrow down what you are looking for. There are good books covering many areas relating to guns. Without a narrower focus, it is hard to make specific recommendations.
Do you want books on:
- hunting
- military firearms (including period)
- other historical (old west, early guns, developers/companies like Browning & Glock, etc)
- war/adventure/disaster/fiction stories involving firearms
- pricing/collecting
- tactics and training
- legal issues
- gun sports
- gunsmithing
- etc.