Useful links

• The 'Att' surcharges of Siam 1889-1908 by Vincent P. Polizatto.
• Siam by Auktionshaus  Christoph Gärtner. 
• Thailand Post. The official site of the Thailand Post Office.
• The Siam Society. The Siam Society - Thailand promotes the preservation of Thai heritage, culture, art, nature, wildlife, flora, through its study trips, lectures, museum, exhibitions, and publications.
• Siamese Philately - Thailand Philatelic Society member Peter Preuss has created a 1700 page study of Thai philately from 1688 through 1949. The whole is supplied as two CD Roms and contains thousands of colour pictures. To find out more including an index and ordering details follow the link above.  
• Cristoph Gartner -  German philatelic dealer with a large number of Thai items. There is a good search engine allowing easy access to well illustrated items.   
• Till Neumann - German dealer for Thailand and worldwide rare stamps and postal history.
• The Anglo-Thai Society
• Joe Luft's Philatelic Resources on the Web - The philatelic index
• Linn Stamp News. The website of the world's largest weekly stamp newspaper.
• Michael Rogers Asian Philately - An American auction house specialising in Asia. Latest news of all their public and postal auctions. Scans of important lots are available. Prices realised for public auctions are usually online within five days of the sale. 
• Scouts on Stamps Society International - You will find some very interesting articles on the Scouts issues, try this link for example - Siam Scouts Overprints. (Thank you to Markku Peltoniemi for this one.)
• The Hong Kong Study Circle.  
• Exponet. Virtual Philatelic Exhibition site. No Thai material but still very interesting. 
• Sudetenland. A site dedicated to the Postal History of the Sudentenland, 1938-1945.
• Stamp Magazine. The home page of one of the UK's leading philatelic magazines.
• The Malay Study Group.
• The France and Colonies Philatelic Society.
• The British Air Mail Society. The BAMS caters for anybody who has an interest in airmails of whatever period on a worldwide basis.All aero subjects are catered for including Balloons,Air Letters,Internal and External flights,Individual Airlines,Air Mail stamps,First Flights,Crash Mail,Zeppelins,and much much more.
  The Royal Philatelic Society London.
• World Stamp numbering System.