1. A libel for Libellus Libeller: On Grounds of Mail Art In The Seventies Artist: Huisman, Hetty Classification: Documentation Materials: artist catalog Accession Number: 2008.21.57
2. A libel for Libellus Libeller: On Grounds of Mail Art In The Seventies Artist: Huisman, Hetty Classification: Documentation Materials: artist catalog Accession Number: 2008.21.16