Karstens, Andres2018-11-052018-11-051966-03-11https://hdl.handle.net/2152.3/10630A letter of appreciation from Colonel Andres Karstens to Dr. Thornton for his attention given to visitors at Brooks Air Force Base.CorrespondencebiographicalU.S. Air Forceappreciation letterDr. William ThorntonColonel Andres Karstens