See more detail at USNO's webpage for this chart. (May be very slow.)
Local times are accurate only if the timezone for the Okie-Tex Star Party clear sky chart is really UT-5.)Also, times, even on USNO's page, are accurate only if the latitude/longitude of the chart for Okie-Tex Star Party is accurate. Check the road map.
Okie-Tex Star Party Clear Sky Chart | All charts along totality | Charts Home