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The development of clay building materials industries in developing countries : report of the Interregional seminar on clay building materials industries, Copenhagen, 12-25 August 1968 / United Nations industrial development organization.
- United Nations,
- 1969.
- [New York] :
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The Latin American economy in 1969 / Economic commission for Latin America.
- 875
- United Nations,
- 1970.
- [New York] :