The John Turner Archive: Pozzolana Cement Project (PPCT), Ruhengeri. A local alternative to Portland cement in Rwanda. Building Community: a third world case book, Ed. Bertha Turner, Building Community Books, London, 1988

The John Turner Archive: Pozzolana Cement Project (PPCT), Ruhengeri. A local alternative to Portland cement in Rwanda. Building Community: a third world case book, Ed. Bertha Turner, Building Community Books, London, 1988

The John Turner Archive: Pozzolana Cement Project (PPCT), Ruhengeri. A local alternative to Portland cement in Rwanda. Building Community: a third world case book, Ed. Bertha Turner, Building Community Books, London, 1988

The John Turner Archive: Pozzolana Cement Project (PPCT), Ruhengeri. A local alternative to Portland cement in Rwanda. Building Community: a third world case book, Ed. Bertha Turner, Building Community Books, London, 1988

The John Turner Archive: Pozzolana Cement Project (PPCT), Ruhengeri. A local alternative to Portland cement in Rwanda. Building Community: a third world case book, Ed. Bertha Turner, Building Community Books, London, 1988

The John Turner Archive: Pozzolana Cement Project (PPCT), Ruhengeri. A local alternative to Portland cement in Rwanda. Building Community: a third world case book, Ed. Bertha Turner, Building Community Books, London, 1988

The John Turner Archive: Pozzolana Cement Project (PPCT), Ruhengeri. A local alternative to Portland cement in Rwanda. Building Community: a third world case book, Ed. Bertha Turner, Building Community Books, London, 1988

The John Turner Archive: Pozzolana Cement Project (PPCT), Ruhengeri. A local alternative to Portland cement in Rwanda. Building Community: a third world case book, Ed. Bertha Turner, Building Community Books, London, 1988