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c.miles: 1905 Above the General Hitchcock Highway at the Mercer Markers
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c.miles: 1905 Agua Caliente Hill and the Rincons from one of the Mercer Markers
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c.miles: 1905 A View from the Mercer Marker Area
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c.miles: 1905 Looking down into Tucson from the Mercer Markers
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c.miles: 1905 Mercer Reference Point Number 1
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c.miles: 1905 Mercer Reference Point Number 2
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c.miles: 1905 Mercer Triangulation Station