Secretary's report 1949/50. P.T.T.I. Congress, Stockholm, August, 1951.
Stencil.
Secretary's report 1949/50. P.T.T.I. Congress, Stockholm, August, 1951.
Stencil.
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Postal Telegraph and Telephone International,
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Secretary's report 1949/50. P.T.T.I. Congress, Stockholm, August, 1951.