Mineral resources of the Elders Ridge quadrangle, Pennsylvania

Precise-level lines have been run over the Elders Ridge quadrangle, and elevations are based on and adjusted between bench marks established by spirit leveling.All bench marks are referred to an aluminum tablet in the foundation of the Seventh Avenue Hotel at Pittsburg marked "738 Pittsburg 1899," the elevation of which is accepted as 738.384 feet above mean sea level, and are stamped with the letters "Pittsburg" in addition to their figures of elevation.A list and description of the bench marks established in this quadrangle for the preservation of altitudes, with their precise elevations, as finally adjusted in 1903, follows.Where a whole number is given without decimals the altitude is not exact, being given only to the nearest foot.Elevation of bench marks in Elders Ridge quadrangle

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