For information on the Holy See and SMOM, try:
Toschi, Umberto (1931), "The Vatican city State from the point of view of 
political geography , in the journal "Geographical Review", 1931 21:4, 
pp529-38
C D'Olivier FARRAN also had two articles on the SMOM in the 1954 and 1955 
volumes of "International and Comparative Law Quarterly
The English version of the Lateran treaties will be in the League of Nations 
Treaty Series.
All of these should be in any decent university library.
Brendan
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