This will work on any difficulty, so be sure you are on the one that provides the tome/page types that you want. I can't promise that this is the easiest or best method, but it's a quick way to generate resplendent chests (which drop pages/tomes and gems with a high frequency) and doesn't require going through dungeons to get them. Additionally, it allows quick farming attempts for the Wheel of Misfortune device.
Set your quest to Act II - The Black Soulstone. Warp to the "Desolate Sands" waypoint. Make your way to the upper left of the area until you find the warp to the "Archives of Zoltan Kulle." Go in, get the checkpoint, and TP and quit. You'll want to retain this checkpoint for the duration of your farming.
Start your game again. The following information is best used with this map from Diablowiki.net:
The areas marked "Ancient Device" are the ones you are aiming for.
Start by warping to the quest location (TP in town upon game start should take you to the Archives.) Exit to the south, cross the bridge, and head south to the closest "Ancient Device" location.
1. See a circle drawn on the ground: Kill the dervishes. Open a resplendent chest as your reward. TP.
2. See a spiral of spine bones: Go to the center. Open a resplendent chest. Kill mobs without moving down the spiral (this spawns more mobs and wastes your time.) TP as soon as they are dead.
3. See the Ancient Device: Explore it if you wish.
4. See none of the above, but ESPECIALLY a flat plane covered in either bone graphics or many giant skulls that spawn enemies: Leave ASAP via TP to avoid wasted time.
Now, Warp to the "Ancient Path" waypoint. Head north, cross the bridge, and move towards the lower "Ancient Device" spawn point as shown on the map. Follow the list as above, except this time, when done, TP and quit, then continue your game if you wish to farm again.
The benefits of this method is that it is a fairly quick way to spawn resplendent chests, and both map tiles that spawn them can and often will spawn on the same map. Nephalem Valor has no effect on tome/page (or gem) drop rates so you don't need to pre-grind, nor do you need to hunt elites/rares or goblins. Once you have run this route a few times you will learn to identify which tile has spawned very quickly, further increasing your farming rate.