So at least one book on datin'. [Thinking a moment.] As for number...
How about I let you decide and do information for information.
Apus is still new, yeah? Then for every book ya want, ya need ta find at least one of a certain thing in an area. An edible plant, a herbal one, or an animal. Areas being like the lake, along the river, the rocky cove, or farther out. If ya find all three in one area, ya get three books, and if ya find more beyond that, ya can get more books, though no repeating the stuff ya find. How does that sound?