R. L · Robert L. · Robert W. · W.L.
| title | media type | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|---|
| Concrete, Vol. 8: January June, 1916 | Hardcover | 978-0-656-23952-8 (0-656-23952-2) | 2019 |
| Concrete, Vol. 8: January June, 1916 | Paperback | 978-1-334-18948-7 (1-334-18948-X) | 2019 |