2004 Studies of Laguna Catemaco by Ma. Guadalupe Eusebio H. et al, and article describing them.
another article: Estudio sistematico de metales pesados en maleza nociva que se desarolla el el Lago de Catemaco, Veracruz, autor: Maria Josefina Paredes Gonzalez, clave: 2004.09.61, which is used by the Laguna fishermen and tour boat operators as the basis for the "Laguna is NOT contaminated" articles, apparently was never published, according to Google (2007).
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