You have a nice introduction on Greek Postal History at Wikipedia.
But of course Jim Jackson of the Big Blue 1840-1940 blog has written three detailed articles on Greek Postal history.
The first one written on June 14th 2012 is dedicated to the Hermes heads series :
http://bigblue1840-1940.blogspot.fr/2012/06/greece-hermes-heads.html
Hardly a week later Jim wrote about the greek stamps issued between 1896 and 1940 :
http://bigblue1840-1940.blogspot.fr/2012/06/greece-1896-1940.html
And he finished (for the moment?) his quest into greek stamps with a an article on AirPost, Postage Due, Postal Tax and Balkan Wars :
http://bigblue1840-1940.blogspot.fr/2012/06/greece-air-post-postage-due-postal-tax.html
Check these articles out if you want to learn more about greek stamps.
Links will be posted on the left of the bog in the 'Philatelic Links' section.
Enjoy!
* Part 1 : the author hopes to be able to concentrate a maximum of articles on greek stamps on this blog, so more articles (when found and freely available on the net) on this subject might be posted in the (near) future.
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