Steering Council DR. LUIZ PAULO SOUTO FORTES President IBGE/DGC AV. BRASIL 15671 PARADA DE LUCAS RIO DE JANEIRO, RJ BRAZIL, CEP 21241-051 PHONE: 55-21-2142 4990 FAX: 55-21-2142 4910 e-mail: fortes@ibge.gov.br TCL. EDUARDO ANDRÉS LAURÍA Vice-President INSTITUTO GEOGRÁFICO MILITAR CABILDO 381 1426 BUENOS AIRES, ARGENTINA C1426AAD PHONE: 54-11-4576 5529 FAX: 54-11-4576 5509 e-mail: elauria@igm.gov.ar DR. CLAUDIO BRUNINI President of Working Group I FACULDAD DE CIENCIAS ASTRONÓMICAS Y GEOFÍSICAS UNIVERSIDAD NACIONAL DE LA PLATA LA PLATA, ARGENTINA e-mail: claudio@fcaglp.edu.ar ING. ANTONIO HERNANDEZ NAVARRO President of Working Group II INEGI AV. HEROE DE NACOZARI 2301 SUR PUERTA 7 NIVEL MEZZANINE AGUASCALIENTES, AGS.C.P. 20270 MEXICO PHONE: 52-449-910 5300 EXT 5870 FAX: 52-449-916 1696 e-mail: antonio.hernandez@inegi.gob.mx ING. LAURA MARLENE SANCHEZ RODRIGUEZ President of Working Group III INSTITUTO GEOGRAFICO AGUSTIN CODAZZI CARRERA 30, No. 48-51 BOGOTA, D.C., COLOMBIA FAX: 57-1-368 0991 e-mail: lsanchez@igac.gov.co