This is a vintage NOAA Map of the wider Las Vegas NV area and most of Southern Nevada, Northwestern Arizona, Southwestern Utah, and Eastern Central California .  Circa 1970's.  I cannot find a date on it.  A small chunk of the map legend was cut out and is missing.  This is likely the part that had the date on it.  There is also green marker written over the legend that says "Obsolete".  Measures 25" x 20".  Printing on both sides.