Number 13-class battleship Number 13-class battleship The "Number 13"-class battleship was a planned class of four fast battleships to be built for the Imperial Japanese Navy (IJN) during the 1920s. The ships never received any names, being known only as "Numbers 13–16". They were intended to reinforce Japan's "eight-eight fleet" of eight battleships and eight battlecruisers after the United States announced a major naval construction program in 1919. The "Number 13" class was designed to be superior to all other existing battleships, planned or building. After the signing of the Washington Naval Treaty in 1922, they were cancelled in November 1923 before construction
International Standard Book Number 2007, and 10 digits long if assigned before 2007. An International Standard Book Number consists of 4 parts (if it is a 10-digit ISBN) or 5 parts (for a 13-digit ISBN): A 13-digit ISBN can be separated into its parts ("prefix element", "registration group", "registrant", "publication" and "check digit"), and when this is done it is customary to separate the parts with hyphens or spaces. Separating the parts ("registration group", "registrant", "publication" and "check digit") of a 10-digit ISBN is also done with either hyphens or spaces. Figuring out how to correctly separate a given ISBN is complicated, because most