Stamp was issued on the occasion of a Natural Rubber Conference held in Kuala Lumpur, Malaysia, in 1968. It depicts a space-filling model of isoprene and a representation of the traditional way of collecting natural rubber latex from a tapped tree.
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“Postage Stamp Commemorating the Natural Rubber Conference in Kuala Lumpur, Malaysia, 1968.” Malaysia, 1968. Witco Stamp Collection, Box 1. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/v979v3125.
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