Catalan Martínez, E., and I. Mugartegui Eguía. “Changing Patterns of Energy Consumption in Guipuzcoa Industry (1862-1925)”. Revista De Historia Industrial — Industrial History Review, vol. 22, no. 52, Jan. 2018, pp. 46-76, doi:10.1344/rhi.v22i52.20986.