Log Category of Documents:
Message, dated 5 Mar 70, originated by Ha, Dl, addressed to U4, requests U4 to keep Dl informed of the time of arrival of the element guided by Comrade Quang; Message dated 12 Mar 70, originated by Sinh, Long Dat, requests the addressee to notify Sinh of the date and the location of the meeting; mentions study of an overt line of communication.