# Is "Utah Blaine (as Jim Mayo)" by Louis L'Amour a First Edition?

> **Quick answer.** A first edition of Utah Blaine (as Jim Mayo) by Louis L'Amour (Ace Books, 1954) is identified by: Ace Double paperback original (D-48), under the pseudonym 'Jim Mayo', bound back-to-back with 'Desert Showdown' by Brad Ward (Samuel A. True first US; pseudonymous Ace Double paperback original.

**Checklist — a true first has these:**
- Ace Double paperback original (D-48), under the pseudonym 'Jim Mayo', bound back-to-back with 'Desert Showdown' by Brad Ward (Samuel A. Peeples)
- Perfect-bound wrappers
- Publisher imprint reads Ace Books
- Not a book-club edition (see below)

| | |
|---|---|
| Author | Louis L'Amour |
| Publisher | Ace Books |
| Year | 1954 |
| True first | US edition |
| Format | Hardcover (trade) |
| Key point | Ace Double paperback original (D-48), under the pseudonym 'Jim Mayo', bound back-to-back… |
| Book-club edition exists? | Yes |

## Points of issue
Ace Double paperback original (D-48), under the pseudonym 'Jim Mayo', bound back-to-back with 'Desert Showdown' by Brad Ward (Samuel A. Peeples); 1954. Perfect-bound wrappers.

## Is this the true first?
True first US; pseudonymous Ace Double paperback original.

## Telling it from reprints & book-club editions
No book-club edition; paperback original.

## Source
New Mexico Literacy Project — Is *Utah Blaine (as Jim Mayo)* by Louis L'Amour a first edition? https://newmexicoliteracyproject.org/first-edition/utah-blaine-as-jim-mayo
CC BY 4.0. Part of the Canonical First-Edition Points of Issue dataset (https://newmexicoliteracyproject.org/api/first-edition-titles.json). Last reviewed 2026-07-03.