Possible Clues:

• Dallas sch
• Dallas sch.
• Mustangs' sch.
• Dallas inst.
• Mustangs' sch
• Laura Bush's alma mater: Abbr.
• The Mustangs' sch.
• Texas Mustangs, for short
• Laura Bush's alma mater
• The Mustangs of the N.C.A.A.