-Agrabah: Cave of Wonders: Dark Chamber
It is in a treasure chest in the middle island. Open the chest to receive
your first Torn Page.

-Monstro: Chamber 6[*]
On top of a platform on the side of the chamber. This platform is too high
to reach with jump, so throw a barrel on the top step. Then jump onto the
barrel and from there jump up to the platform to open the chest. (You can also
Superglide over from the opposite ledge if you have it learned).

-Atlantica: Ariel's Grotto
Go into Ariel's Grotto and simply open all the treasure chests. It should
be near the top.

-Halloween Town: Research Lab
Search the bookcase to find this Torn Page.

-Total of 51 Dalmations[*]
After finding a total of 51+ Dalmation pups (17+ chests' worth), head over
to the Piano Room of the Dalmations' House (off of the 2nd District) and
approach Pongo & Perdita; they will reward you with a Torn Page. You may have
to collect previous prizes from them at this point if you haven't done so
already.