UFO Article (Blog): 

“Neglected Lights: Mexico’s 1970s Saucer Wave”,

30 January 2012 (Inexplicata.blogspot.com)

The article contains a report on a 15 August 1973 (45 minutes long) UFO car chase that occurred near Ciudad Cuauhtémoc 
(the state of Chihuahua, Northern Mexico):

http://inexplicata.blogspot.com/2012/01/neglected-lights-mexicos-1970s-saucer.html

The city is situated 103 kilometres (64 miles) west of the state capital of Chihuahua, according to Wikipedia.

Map of Mexico 
(mapasdemexico.org image)