Publications 2001

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Drewes H. (2001). The unified height reference system for the Americas. 7th UN Reg. Cart. Conf. for the Americas, E/CONF.93/INF.14.

Tremel H., Sánchez L., Drewes. (2001). Procesamiento de la red GPS basica de Colombia: Marco Geocentrico Nacional - MAGNA. Revista Cartografica IPGH; No. 73: 7-23.