I just discovered that Leeds University have digitalized their issues of the Gryphon magazine. It's of particular interest for the December 1922 issue, which contains The Clerke's Compleint poem of Tolkien, is also available in pdf format :

[edit - on hold until I can confirm copyright status -Jeremy]

If the owner of Tolkien Books read this, he can also update the cover on his page : http://www.tolkienbooks.net/php/details2.php?id=29