The glue in Mom has here is titled: Time Span of Books and Pages. Bummer I didn't notice it was bent when I took a photo so we don't see the page numbers.
The numbers down the side are (best guesses):
BC
600
588
564
495
421
361
130
91
52
0
35
321
7
421
I hope it is clear as to what book they are pointing to.
If you find a link to this graphic on lds.org (or elsewhere) please post it.