We do not have a book dedicated specifically to the group and squad; there is a series titled United States Army in World War II that may contain information.
There is a website http://www.456bg.org with tabs and more information for the 744th, 745th, 746th and 747th squadrons.
There is a recorded interview that is accessible through the WorldCat catalog that can be listened to on a computer titled “George Reed oral history interview” a publication of the National Museum of the Pacific. The museum is in Texas and they have an Oral History Collection. Their website is http://www.pacificwarmueum.org .
There is also the Army Air Corps Library and Museum website, http://www.armyaircorpsmuseum.org .