cdigital.dgb.uanl.mxcdigital.dgb.uanl.mx/la/1020024572/1020024572_009.pdf · looking under a broad,...
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cdigital.dgb.uanl.mxcdigital.dgb.uanl.mx/la/1020024572/1020024572_009.pdf · looking under a broad, flat, slab-like ledge might be descried a deep basin four feet in diameter filled
