The Desert Aqueducts is a two-part tome found in Act II of Diablo III, found in the aqueducts below the Dahlgur Oasis, in two satchels, one in the Western Channel and one in the Eastern Channel (in either order).
This tome is required for the Historian of Caldeum achievement.
The parts read as follows:
The Caldeum aqueducts were created by order of the trade consortium council after the Dahlgur Oasis was discovered three centuries ago. Though Caldeum had been prosperous for many years, a reliable source of water allowed the city to grow even further. Luxurious public fountains were built to provide safe drinking water for everyone. — Abd al-Hazir
In recent days, the aqueducts have become dilapidated and infested with vermin. The Imperial Guard has done nothing, proclaiming that the aqueducts were in tolerable condition. But I have seen them with my own eyes, and I know the truth. Many wealthy families, including myself, now prefer well water for our homes. — Abd al-Hazir