Positive degree 16: 185x 260.
Large 16: 2 10× 297mm.
Large 18 (international 18): 185× 230mm.
32 carats:130×185mm
Large 32 holes:140× 203mm
Poetry anthology: usually in a narrow format.
Theoretical books: Big 32 is more commonly used.
Children's books: near the square opening
Small dictionary: size under 42, 106/ 173mm.
Science and technology books: need larger and wider format, large size 16, positive size 16.
Photo album: There are many near the square.
It can be inferred that there are 24 folio books in the library that are not common.