How to identify a Harper first edition
Harper has stated “First Edition” since 1922, but once it added number lines it often left the statement on later printings. For modern Harper books, trust the number line over the words.
What to look for, by period
1912 – 1922
Harper & Brothers used two-letter codes for the month and year of printing; the code should match the date on the title page.
1922 – 1960s
“First Edition” on the copyright page of first printings, still often alongside a printing code.
1970s – today
Harper & Row and then HarperCollins: “First Edition” plus a number line. The statement was frequently left on later printings, so the lowest number in the line is what counts.
Dates are approximate. Imprints and individual titles sometimes differ; for valuable books, check a bibliography of the author.
Check your Harper book
New to number lines? Read how to read a number line, and how to spot a book club edition.