The Desert Eagle ammo is not the .50 cal BMG ( Browning Machine Gun) round that you’re possibly imagining. If it were the hand grip would be enormous, far too big to hold.
The Desert Eagle uses a .50 cal AE (action express) which is a much smaller round (shorter, and lighter)
It will go through a wall, just not a 12" one. An encyclopedia would not present much of a challenge to it.
From 2.50 in this vid, you can see it will penetrate about 11" of solid wood. A BMG would obliterate the lot.
Edit: although, if you really must, there is this: