For dates of founding of mutliple forts listed below:
Bagaloni, V., & Pedrotta, V. (2018). Frontiers and Fortlets in the Pampa Region, Argentina. Historical Archaeology, 52(2), 348–371. https://doi.org/10.1007/s41636-018-0111-1. Blanca Grande, Protectora Argentina [Bahia Blanca] and Antiguo Tapalquen (352), Nueva Esperanza and Miñana (354), Fe, Recompensa and San Martin (355).
For dates of founding of mutliple forts listed below:
IV Censo general de la nación: Censo de población. (1947). Belgrano and San Carlos [de Bolívar] (69), Guaminí (70), Trenque Lauquen and Trez Arroyos (71).
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Captions
A map of historic forts and fortlets in the Pampas