1. Untitled (Correspondence from Bob, Heidi & Matti to Tom Marioni/MOCA). nd. Bookmark Untitled (Correspondence from Bob, Heidi & Matti to Tom Marioni/MOCA). nd., accession number 1995.46.13.60. Search result 1 Artist: Bob, Heidi & Matti? Classification: Work on paper Materials: Letter. Black typescript and blue ball point pen on white paper. Dimensions: 11 3/4 x 8 1/4 in. Accession Number: 1995.46.13.60