ANNEX TO THE CONVENTION : Regulations respecting the laws and customs of war on land #Section I : On belligerents #Chapter II : On prisoners of war - Art. 14.
Art. 14. A bureau for information relative to prisoners of war is instituted, on the commencement of hostilities, in each of the belligerent States, and, when necessary, in the neutral countries on whose territory belligerents have been received. This bureau is intended to answer all inquiries about prisoners of war, and is furnished by the various services concerned with all the necessary information to enable it to keep an individual return for each prisoner of war. It is kept informed of internments and changes, as well as of admissions into hospital and deaths.
It is also the duty of the information bureau to receive and collect all objects of personal use, valuables, letters, etc., found on the battlefields or left by prisoners who have died in hospital or ambulance, and to transmit them to those interested.