H.H. · R. H. · Richard H. · Richard Hammack
| title | media type | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|---|
| Book of Proof | Hardcover | 978-0-9894721-3-5 (0-9894721-3-2) | 2019 |
| Book of Proof | Paperback | 978-0-9894721-2-8 (0-9894721-2-4) | 2018 |
| Book of Proof | Hardcover | 978-0-9894721-1-1 (0-9894721-1-6) | 2016 |