clair, jean clarenbach, dietrich   clark, gordon matta- -> matta-clark, gordon clark, graham clark, kenneth clark, lygia * (2) clark, william w clarke, john r claus, elisabeth claus, juergen/piene, otto clausen, barbara claussen, peter cornelius (2) claustres, annie clayeux, louis clerin, philippe clesinger, auguste * cleveland museum of art cm merki