Measurement of organochlorine pesticides in drinking water: laboratory technical proficiency testing in Mexico by Leyva-Morales, J. B., Bastidas-Bastidas, P. J., Muñiz-Valencia, R., Ceballos Magaña, S. G., Ponce-Vélez, G., Aguilera-Márquez, D., Grajeda-Cota, P., Navidad-Murrieta, M. S., Flores-Munguía, M. E., Ramírez-Castillo, J. A., Romero-Bañuelos, C. A., Ruíz-Ramos, R., Aguilar-Zarate, G., Huerta-Beristain, G.

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Concentrations of selected trace metals (Cu, Pb, Zn), organochlorines (PCBs, HCB) and total PAHs in mangrove oysters from the Pacific Coast of Mexico: an overview by Páez-Osuna, F, Ruiz-Fernández, A.C, Botello, A.V, Ponce-Vélez, G, Osuna-López, J.I, Frı́as-Espericueta, M.G, López-López, G, Zazueta-Padilla, H.M

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Polycyclic aromatic hydrocarbons in coastal sediments from the subtropical Mexican Pacific by Garcı́a-Ruelas, C., Botello, A.V., Ponce-Vélez, G., Dı́az-González, G.

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Persistent organochlorine pesticides in coastal sediments from Petacalco Bay, Guerrero, Mexico by Leyva-Cardoso, D.O, Ponce-Velez, G, Botello, A.V, Diaz-Gonzalez, G

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PAH levels in bivalve mollusks from the Mexican subtropical pacific by BOTELLO, A. V, GARCIA-RUELAS, C, PONCE-VELEZ, G

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Organochlorine pesticides in sediments of the coastal ecosystems from Veracruz, Mexico by Ponce-Vélez, G., Botello, A.V., García-Ruelas, C.

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