All the information about stamps given on this blog is taken from the postal site of the respected countries and from the other sources. This blog is only the platform to provide you latest information about upcoming stamps.
For more details you can refer the postal site of the respected country.
also Brasil issued a stamp on Louis Braille Bicentenary:
http://www.lerparaver.com/node/8206
http://www.lerparaver.com/files/Selo_Braille.jpg
best,
Pablo
Thanks for the information