gems, jade, Fischer-Book

Bulhões presents the definitive engineering studies for extending the Bahia–São Francisco railway from Alagoinhas toward Juazeiro and Casa Nova, describing the proposed route, topography, rivers, terrain, settlements, engineering difficulties, and natural resources encountered across the interior of Bahia. Prepared principally as a technical report for railway construction, the work includes geographical and geological observations made during surveys of regions that were still imperfectly documented. Its relevance to mineralogical and gemological research lies in observations on the rocks, minerals, and potentially exploitable resources encountered along the proposed railway corridor, providing contemporary evidence for nineteenth-century knowledge of the mineral-producing districts of Bahia.