Links

Informática/Computers:

• CIRCUITO INTEGRADO _ O chip que mudou o mundo - 1 Quadro ( Fábio Flosi - Brasil )
• Computer history - in a different way 
• Computers on Stamps  
• Scout Computer & Radio Stamps 
• Postage rates worldwide 
• Tecnologia nos selos de França 
• Computers on stamps - Wired
• Informatique et Télécommunications - Fédération des Equipes Bull
• The Stamp-Sized Story of Computers
• Cyber Philately  
• From Abacus to Internet 
• From Abacus to Laptop - Johann Vandenhaute 
• Computers on Dutch stamps 
• Computers on Stamps - Teunis van Beek 
• The story of the computer - Philatelica.ro 
• Computer Stamps Collector - Gao Xiang
• Mathematical Study Unit (MSU) 
• Philamat 
• SCI-Philately 
• Philatelic Computing Study Group (PCSG) 
• Images of Mathematicians on Postage Stamps 
• Mathematical Stamp Collecting 
• XA Space Page 
• Amateur Radio through Philately
• Estudo sobre o selo de série base portuguesa Instrumentos de trabalho
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Aconselhados (do autor):

• Secção Filatélica da AAC 
• S. Vicente de Paulo na Filatelia
• Águeda-a-Linda filatelicamente
• Condeixa na Filatelia
• Diários - Miguel Torga

Outros (referências ao site):

• Roger's Philatelic Links  
• Filatelia em Portugal