1.
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Genova : A.G.I.S, 1950.
Multiple copies available |
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2.
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[French version] [print edition] /
Genève : UIT, 1950.
Archives Storage Room 32 Z 41/1950/1 |
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3.
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[Spanish version] [print edition] /
Ginebra : UIT, 1950.
Multiple copies available |
|
4.
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[English version] [print edition] /
Geneva : ITU, 1950.
Multiple copies available |
|
5.
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[Spanish version] [electronic resource] /
Ginebra : UIT, 1950, PDF 2016.
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6.
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7.
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[French version] [electronic resource] /
Genève : UIT, 1950, PDF 2016.
|
8.
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[English version] [electronic resource] /
Geneva : ITU, 1950, PDF 2016.
|