Personal correspondence: T-Z (van Vleck - Zocher) Correspondents include: Prof JH van Vleck; Erna Vohren; Verein Deutsche Ingenieure; Dr Wagner; Prof R Watson Watt; Prof von Wartenberg; F Weigert; Prof G Weil; Arnold Weissberger; K Weissenberg; Eric Werner; E Wigner; Prof E Wiersma; AH Wilson; H Zanstra; MW Zemansky and Prof H Zocher. The majority of the file consists of correspondence with van Vleck, mostly on low temperature research, dating from 1936-1943. The file also contains some letters from unidentified correspondents. c.1924-1956