| 20-27 August 1969: Congress Internl Pure & Applied Chemistry APM 2820
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| 20-27 August 1969: 22nd Congress of International of Pure and Applied Chemistry, Sydney APM 2820 on plain addressed cover affixed with blue 5c QEII stamp cancelled "20 AUG 1969" FDU
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Item #: INV-127194
Condition Co
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