| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Wagon-Making in the United States during the Late-19th through Mid-20th Centuries: A Study of the Gruber Wagon Works at Mt. Pleasant, Pennsylvania | 978-O-939923-97-7 (O-939923-97-1) | 2005 |
C.R. · C Ray · Clayton E. Ray · E -R · E. Ray