| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Number Key Practice for Use on Typewriter, Ten-Key and Keypunch Keyboards | 978-O-O7-OO61O5-7 (O-O7-OO61O5-X) | 1975 | George P. Grill · J. L. Rowe |
E.R. Bloomquist · Edward R. Bloomquist · R. B. · R. Gordon Bloomquist