Robert Motherwell (1915-1991) _Untitled_ signed with the artist's initials 'RM' (upper left) oil on canvasboard 9 x 12 in. (22.9 x 30.5 cm.) Painted _circa _1964....

Robert Motherwell (1915-1991) _Tapestry Study No. 5_ signed with the artist's initials and dated 'RM 72' (upper right) acrylic on paper 22 1/8 x 11 3/8 in. (53.7 x 28.9 cm.) Painted in 1972....

Robert Motherwell (1915-1991) _Untitled_ signed with the artist's initials and dated 'RM 74' (lower right) acrylic and charcoal on paper 31 1/8 x 22 ½ in. (79.1 x 57.2 cm.) Executed in 1974....

ROBERT MOTHERWELL (1915-1991) _Black on Black_ signed and numbered 'Robert Motherwell 5/58' (lower right) lithograph on chine collé laid down on paper 27 ¾ x 22 1/8 in. (70.5 x 56.2 cm.) Executed...

Robert Motherwell (1915-1991) _Open No. 81: In Blue with Charcoal Line_ signed with the artist's initials and dated 'RM 69' (upper right); signed again, titled and dated again 'R. Motherwell Summer,...

Robert Motherwell (1915-1991) _Mural Study_ signed and dated 'RM April 78' (upper left); signed again and dated again 'Robert Motherwell April 1978' (on the reverse) oil and graphite on paper 13 3...

Robert Motherwell (1915-1991) _Three Young Birds Waiting to be Fed_ signed with the artist's initials 'RM' (upper right); titled and dated '"3 YOUNG BIRDS WAITING TO BE FED" 1952' (on a paper label ...

Robert Motherwell (1915-1991) _A View No. 3_ signed with the artist's initials 'RM' (upper right) oil and ink on paper 14 ¼ x 11 ¼ in. (36.2 x 28.6 cm.) Executed _circa _1958....

Robert Motherwell (1915-1991) _Málaga [Málaga (Spanish Elegy Series)]_ incised with the artist's initials 'RM' (upper left); signed 'R. Motherwell' (on the reverse) oil and enamel on Masonite 14 x...

Robert Motherwell (1915-1991) _A Chord for Alban Berg_ signed with the artist's initials 'RM' (upper left) acrylic on canvas 60 x 44 in. (152.4 x 111.8 cm.) Painted in 1981-1982....