Log books , as mentioned by TCU.
Used to enjoy filling out the young'uns log books. Some of them had notched up a lot of miles, especially the school boarders.
Most interesting one was an 80 something American lady who loved flying and had about 6 logbooks all taped together. Earliest entries were on PanAm clippers across the Pacific. She had just about been everywhere and on just about every aircraft.
Emeritus