1. Some SuDoc classes include many small publications which are put in boxes on the shelves; look in the boxes as well as beside them.
2. Check the reshelve area behind the GPL workroom.
3. If not found but record does not say it is checked out, fill out a blue Search Request form (on counter). Put your initials and the date in upper right corner. Put in search box near where GPL keys are kept, inside workroom door.