© Artists Rights Society (ARS), New York/VG Bild-Kunst, Bonn Luftpost (Airmail) Joseph Beuys Accession Date: 05/01/06 Accession Number: F-BEUYS-106.029a,b 1971 airmail envelope with page from a chemistry textbook; with several stamps Envelope: 4 1/2 x 6 3/8 in. (11.43 x 16.19 cm) Page:4 1/4 x 5 3/4 in. (10.8 x 14.61 cm)