Stamp depicts the maple leaf cement factory in Daud Khel, Pakistan. The Colombo Plan for Cooperative Economic and Social Development in Asia and the Pacific is a regional inter-governmental organization. It was established on July 1, 1951 by Australia, Canada, India, Pakistan, New Zealand, Sri Lanka, and the United Kingdom and currently has expanded to include 26 member countries. The Colombo Plan is a partnership concept of self-help and mutual-help in development aimed at socio-economic progress of its member countries.
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“Pakistani Postage Stamp Commemorating the 20th Anniversary of the Colombo Plan.” Pakistan: Pakistan Security Printing Corporation LTD., 1971. Witco Stamp Collection, Box 6. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/q811kj674.
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