Publisher's Synopsis
Excerpt from Instrucciones para los Trabajos Geodésicos
La inclinacion de la carretera no debe llegar a tres grados sexagesimales en ningun trozo de la base.
Desde cada uno de los extremos de ésta, y á la altura ordinaria de un pilar de observacion, se debe divisar una señal que no exceda de dos metros de altura colocada en el otro ex tremo.
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