GERSTACKER, Dr. Ludwig. Das Farbenmischbuch. XI, 65 pp., illustrated throughout with 60 colour plates on coated paper. 8vo, 238 x 167 mm., bound in original cloth. Stuttgart: Berliner Union, 1954. A later edition of this collection of colour printing samples with mixed colour proofs in halftones and several examples of three- and four-colour printing and three-colour circles, first published in 1934. Herbert comments: "Many color plates in 'Nagra-Farben' giving range of hues and examples of application." OCLC lists only the copy in the British Library.