I can't find that many of them, but I love the one's I've found...
More about...Studio: a brief history - http://www.studiointernational.com/about_studio.asp
Lots for sale here but pics have massive watermarks on them, but you can see more covers form the 60's and 70's http://www.vintagemagazinecompany.co.uk/710-studio-international
Studio was first published in April 1893 under the title The Studio: An Illustrated Magazine of Fine and Applied Art. It rapidly established itself as one of the most successful fine art periodicals in the English-speaking world. Among others, it featured the work of the illustrator Aubrey Beardsley – who even designed an elegant cover – and the architects Charles Rennie Mackintosh and CFA Voysey. It was one of the first art magazines to adopt photomechanical reproduction, a process that would dominate art publishing for a century.
Found at:
http://www.counter-print.co.uk/
http://www.intute.ac.uk/cgi-bin/fullrecord.pl?handle=20070605-181716
http://www.studio-international.co.uk/
http://www.leftmatrix.com/studiointer180.html
http://ahoylandahoy.blogspot.com/2009/05/layout-of-studio-international.html