Original 35mm black and white negative taken by Dallas Times Herald staff photographer William Allen. This image shows a Dallas Police officer outside in the intersection of Elm and Houston Streets securing the Texas School Book Depository on November 22, 1963. The negative is on Kodak Tri-X Pan Film. This image is labeled #15 on section 2 of negative strip 26.The old TMS record for the images on this negative strip indicate that the photographer was William Allen. Based on research conducted by collections intern Mark Davies in June and July 2012, curatorial and collections staff concluded that Allen did indeed take these pictures. (Lindsey Richardson, 7/24/13) Also noted at that meeting, these pictures were taken between 12.30 and 1pm on the afternoon of the assassination. (Lindsey Richardson, 10/15/13) Labeled J36 on contact sheet 1989.100.0062Police officers outside the Texas School Book Depository