The Vertical Shaft Brick Kiln (VSBK) in Nicaragua (pdf 500k), Martin Melendez, Grupo Sofonias Nicaragua (July 2003)
Courtesy Fernando Martirena ECOsur
Aprovecho ARECOP Biomass Energy Foundation CEDESOL CEIHD ETHOS GTZ ProBEC HEDON PCIA Renewable Energy Policy Project Solar Cookers International The Gold Standard Fndn