Mexico, 23.634501, -102.552784Smith, Marion O., 1942-20221972Photocopy of typewritten report of caving expedition to Mexico involving multiple participants near the Rio Conchos who attempted to reach El Sótano. On December 14, ten members successfully descended and ascended El Sótano, encountering remnants of a previous camp.image/jp2eng||spahttp://rightsstatements.org/vocab/InC/1.0/Explosives--AdditivesSaltpeterDiscovery and explorationSoldiersNamesVandalismIndependent scholarsUnited States--History--Civil War, 1861-1865--GraffitiCavingSignatures (Writing)|Tourism--Moral and ethical aspectsUnited States--History--Civil War, 1861-1865--Personal narrativesSaltpeter industry--HistoryGunpowder industryGuano industryNitratesCavesSpeleologyJournal of Spelean HistorySpeleologistsGeology, EconomicGraffitiGeotourismSustainable tourismUnited States--History--Civil War, 1861-1865Confederate States of AmericaConfederate States of America. Nitre and Mining BureauManufacturing industries--United States--History--19th centuryManufacturing industries--Confederate States of America--History--19th centuryMineral industries--United States--History--19th centuryMineral industries--Confederate States of America--History--19th centurySaltpeter industry--United StatesGunpowder--United StatesNitrogen industries--United StatesSaltpeter industry--Confederate States of AmericaGunpowder--Confederate States of AmericaNitrogen industries--Confederate States of AmericaBats--ManureGuanoLocal historyA December, 1972, Trip to MexicoText