Letter with Attachments Covering letter for materials of the 13th WG 2.5 meeting held in Argonne and Chicago between 14th and 18th July 1986 and these materials (list of documents, minutes of the meeting, list of WG members) themselves. (Doc. "St.Pierre-19", "Argonne-1", "Argonne-3", "Argonne-4".) Date: 20.11.1986 Original document language: English Authors: Mladen A. Vouk Addressee: Rosalie A. Pocock (Zobel-Pocock)