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Productivity Campaign (North Korea)
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Productivity Movement (Singapore)
Productivity Conference '72 issue of Portugal
Short desc: Productivity Conference '72
Issuer:
Portugal
Date: 4/11/1973
Occasion:
Productivity Conference '72
Consists of 3 stamps:
(See stamps as list)
1e d=graphs
4e d=odometer
9e
All are perf=14.5
Record of changes