Sorry. The correct link for the 1:50000 Mexican geo maps is
http://portaljsp.sgm.gob.mx/cartas_impresas/productos/cartas/cartas50/geologia50/numcarta50.html
The link to similar maps at 1:250000 for the whole country is
http://portaljsp.sgm.gob.mx/cartas_impresas/productos/cartas/cartas250/geologia/numcarta250.html
--Mixon
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Never play leapfrog with a unicorn.
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