Number line decoder
Type the row of numbers from your book's copyright page and we will tell you which printing it is.
Examples
10 9 8 7 6 5 4 3 2 1first printing1 3 5 7 9 10 8 6 4 2alternating, first printing2 3 4 5 6 73 72 71 70second printing, 19709 8 7 6 5 4 3 2Random House with First Edition
Frequently asked questions
How do I read a number line?
Find the row of numbers on the copyright page. The lowest number present is the printing: a line that still includes 1 is a first printing, and one whose lowest number is 3 is a third printing.
Why does my number line not start at 1?
Each reprint removes the lowest number, so a line starting at 4 is a fourth printing. The main exception is Random House, which for many years started first printings at 2 and marked them First Edition.
What does a line like 1 3 5 7 9 10 8 6 4 2 mean?
It is an alternating line, laid out so it stays centred as numbers are removed. Read it the same way: the lowest number present is the printing, so this one is a first printing.
Does the number line prove a first edition?
It tells you the printing, not the edition. Check the copyright page for the edition statement too, and the known points of issue for valuable books.