Where can I find them?

I found them all throughout the first few levels of Watchers Keep. (I'm assuming you're talking about the handwritten notes regarding Lum's Machine.)

You can't miss them
Most are found on the top level i think
But anywhere you loot a chest or a bookcase etc there is liekly to be one
Is quite a few about

SPOILER
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There are six hand-written notes to raise your six stats by one, there
is one to get the Storm Mace and there is another one that I can't remember what it does. Total:8

Thanks guys. I just didn't remember where do you find most of them.

Byronas, i have the list written down, want it? It tells you what they do.