The are probably some initials of people, perhaps the person who transcribed it or was writing on behalf of someone else.
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??? oh thank you so much Alphecca Stars.I checked the letter again and I found the name Gwendolyn T. Quackenbush.I think gtq means the initial of this name.thank you~!Yes, this is called the "identification line." See #5 here http://jobsearchtech.about.com/