From International Signal Code Alphabet
Medium: Ink on paper with tracing paper overlay and collage Dimensions: Sheet: 8 1/2 x 11 in. (21.6 x 27.9 cm) Credit Line: Collection UCLA Grunwald Center for the Graphic Arts, Hammer Museum. Corita Kent Bequest. Accession No.: 1990.1.1166 Paper/Support: Paper Inscriptions: u.r. handwritten in ink: "12"; c.r. handwritten in ink: "yellow letters on edge of blue"; c. handwritten in ink: "where lines go on black + red + blue - make yellow / where lines go on yellow - make them red"; verso, u.r. handwritten in pencil: "12 +19"
"Untitled." Corita Kent in the Grunwald Center Collection. Los Angeles: Hammer Museum, 2017. https://hammer.ucla.edu/collections/grunwald-center-collection/corita-kent/art/untitled-preparatory-material-for-z-is-for-zorba/.