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2. Building Materials for Housing, Report of the Executive Director, UNCHS;UNCHS;Habitat International,1993
3. Mud, Mud; the Potential of Earth-based Materials for Third World Housing;Agarwal,1984
4. Affordable building materials for the poor;International Year of Shelter for the Homeless;Bulletin of the International Year of Shelter for the Homeless,1987
5. Building Materials for Housing, Report of the Executive Director, UNCHS;UNCHS;Habitat International,1993