12mos

Updated: August 12, 2026

Librarian J. Winter Jones, of the British Museum, recommended classing all books above twelve inches in height as folios, those between ten and twelve inches as quartos, those from seven to ten inches as octavos, and all measuring seven inches or under as 12mos. Mr.

Ainsworth Rand Spofford - A Book for All Readers: An Aid to the Collection, Use, and Preservation of Books: and the Formation of Public and Private Libraries