Letter from the Russian Association of Physicists in Moscow to Dr. Dirac inviting him to participate and read a paper at their upcoming Conference of Physicists in August.
Letter to Dr. Dirac, July 10,1 928.
Ukrainian Institute of Physics and Technology
Certificate from the Ukrainian Institute of Physics and Technology to Dr. Dirac inviting him to participate in the theoretical conference of УФТИ for scientific consultation and asking him for assistance.
Program and schedule for the second Leipziger Universitäts-Woche, June 16,1928-June 24, 1928.
Arbeitsausschuß der Leipziger Universitäts-Woche
Program and schedule of events for the second University Week at Leipzig.