| The catalog of stones ever made (data collected by CVA) (cva-katalog_2013.PDF): |  |
| George F. Hardy\'s book in Hungarian (Anker_konyv.pdf): | |
| Bruckmann Lustschloss NF 34 + NF 8 (bruckmann_lustschloss.pdf): | |
| 2025 DE (Anker-2025-DE.pdf): | |
| 2025 NL (Anker-2025-NL.pdf): | |
| 2025 EN (Anker-2025-EN.pdf): | |
| 2025 EN Sunday first (2025-Anker-EN-SU-first.pdf): | |
| George Hardy's book in English (Book-PC-2014.pdf): | |
| George Hardy's book in German (Buch-PC.pdf): | |
