The attached "memorandum from prisoner of war records" is part of my great-great grandfather's compiled military service record. Regarding the information located in the "information obtained from" column: I've been told that BB is Benton Barracks and CP is Camp Parole. If so, what are the abbreviations EX and CGB? Second, does anyone know how I might obtain the information that is located there? Volumes and pages are listed but I don't know what they refer to.