who was the cover artist of the 500 hats of bartholomew cubbins also wrote duck the halls: a robertson family christmas ?
SELECT DISTINCT var_uri where brack_open dbr_The_500_Hats_of_Bartholomew_Cubbins dbo_coverArtist var_uri sep_dot dbr_Duck_the_Halls:_A_Robertson_Family_Christmas dbp_writer var_uri brack_close