These slides were originally in sleeves labeled "Leisure."
Some slides are hand-labeled with "PBM," which stands for Peter B. McMillen.
Some slides are labeled with "MB." the meaning of this notation is unknown.
The slides have been labeled with "LE; 1989," which stands for "Leisure, 1989" and a slide number.
Slides in this sub-group are numbered 1 - 88.
