Learning from books

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I thought I would post this to see if anyone had some good house rules about learning from books.

I'm running a game where the characters found a book written by one of the game world's most famous generals.

We were thinking that the skills one would learn from this book could be:
- Military History
- Administration (Military)
- Leadership
- Strategy
- Tactics
- etc

So, how would one learn from this book? I'm thinking of putting a limit on the skills such that someone reading the book would not gain any knowledge beyond the skill level of the writer. And I was thinking that the reader could gain a set number of skill points or maybe skill levels from the book with it acting as a teacher.

So, assuming the writers writing and teaching skill was at least 12 and he rolled well when writing it, it could serve as a teacher. Then we can say that in each area (above) the user could gain up to say ... 20 skill points. They would be studied at the rate of 200 hours per point.

What does everyone think of this approach?