I just received three books this week (yes I'm treating myself!). I am always searching for any book that relates to the 540th Combat Engineers, and found three on the internet last week that make mention of my dad's unit.
The three are as follows:
Operation in North African Waters - October 1942-June 1943
Written by Samuel Eliot Morison
This is Volume II in the series - History of United States Naval Operations in World War II
Allies - Pearl Harbor to D-Day
Written by John S. D. Eisenhower
Yes you are correct this is Dwight D Eisenhower's son. He writes about the very successful Anglo-American military Alliance of WWII.
With Utmost Spirit - Allied Naval Operations in the Mediterranean, 1942-1945
Written by Barbara Brooks Tomblin
I got the books through Amazon.com. I can usually find really, really good deals there and once again it was proven to be true.
Since I just got them, I've only had time to do a rudimentary perusal, but will let you know what I think. Of course I am thrilled anytime I find more history of my father's unit, regardless of how big or how small. Ah, more research books for my book! 
Proud Daughter of Walter (Monday) Poniedzialek
540th Engineer Combat Regiment, 2833rd Bn, H&S Co, 4th Platoon
There's "No Bridge Too Far"