Show the mexican Douin lary unc ianes the international boundary line between the united states and the republic of mexico is marked by pyramids of stones placed at irregular distances along the line all the way from the rio grande to tile pacific ocean wherever it was found practicable abla to do so these pyramids were built on prominent peaks at road crossings forde etc the line was not surveyed as is the usual custom the location of the monuments being based on astronomical calculations and j vatious vat ions st louis republic |