Earlier edition published in 1938 by the British Colour Council under title: Horticultural colour chart. "R. H. S. colour chart" (4 p.) "Table of cross-references" (29 p.) inserted. siris_sil_51568 ...
R.H.S. catalog for April, 1986, describes this as a new ed. Informational brochure, in English, Dutch, German and French, inserted in case. https://siris-libraries.si ...
John David, Head of Horticultural Taxonomy, tells Rebecca how & why the chart is compiled.