This link has a list of all the grounds tomes, target levels, and maximum levels for each page. The best way to do it in my mind is to find all the enemies in your level range with pages and then pick an area that also has an item drop from a brown chest you want (or can sell).
I would advise sticking to the GoV pages since you get the buffs from the Prowess. So with that in mind you might want to pick areas that will have pages that follow each other if you plan to stay in zone for a long time. Don't forget your Signal/Tactics Pearl before you go!