https://docs.google.com/viewer?a=v&pid=gmail&attid=0.1&thid=13e50f07819b7f86&mt=application/pdf&url=https://mail.google.com/mail/?ui%3D2%26ik%3D9ae69c338e%26view%3Datt%26th%3D13e50f07819b7f86%26attid%3D0.1%26disp%3Dsafe%26realattid%3Dfile0%26zw&sig=AHIEtbTWms7Y-fj8cv8OmL3yqmXk0pgggw
Fuente: Ramon Mosquera Rivas
Sociedad Geográfica de Colombia
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