Alot of people are getting confused with Album PAGE & SIDE.
Just look at a text book, magazine or novel, and go to Page 33 or Side 33 (it is the same).
A Leaf has 2 Sides (Page). So the back of Page 33 will be Page 34
“One page = one side = one side of a leaf of something printed or written, as a book, manuscript, or letter”
eg A 40 side (page) album will have 20 leafs.
Hope this helps
Vincent Lai 🙂