Portuguese commemorative stamp issue
The issue "Ano Internacional da Cristalografia" consists of five stamps and a souvenir sheet, which illustrate crystallography in the areas of geology, physics, mathematics, chemistry and biology. In the souvenir sheet water is present as an aggregating component.
In addition postage envelopes and an informative brochure with a text on the subject is produced.
![[stamp issue]](https://www.iycr2014.org/__data/assets/image/0007/99520/DIV_cristalografia_small.jpg)
Reproduction authorized by CTT Correios de Portugal
| Contact | Fátima Santos Marques fatima.s.marques@ctt.pt |
| URL | http://www.ctt.pt |
| Category | postage stamps |