Dear Mr. and Mrs. Brothers, As you may know, we are still on the road returning to the campus from our tour. One of the high points of the trip was the kind hospitality you extended to us. The rest you provided in your beautiful home gave us just the energy we needed to complete the trip. May the Lord bless you for your kindness to us. We thank you. Sincerely yours, Nan and Joan Bennett What type of letter is this?