eng12-0 Research for philatelic communication round the world |
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12-001 Statistics and
research about postal delivery effect of the mail round the world with
ordinary postage |
12-002 Statistics and
research about postal delivery effect of the mail round the world with
air,priority,registered postage |
12-003 Statistics and
research about the postage for international communication in countries |
12-004 research about
postal chops in countries |
12-005 Multifarious international
postal official item |
12-006 Research of non
normal delivered mails in philatelic communication round the world |
12-007 Preliminary approach
about respond and processing mode of foreign countries statesmen for philatelic
communication |
12-008 Relevance of Chinese
stamps with countries |
12-009 Annex：Reports about
this style of philatelic communication |
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