Volumes 1 through 14, first 10 bound in leather, 1983 through 1989, excellent condition, by Koniger & Wurstle, elephant folio large format. This is the definitive work on the genus Masdevallia orchids. Each volume contains about 15 species with a plate in beautiful watercolor, and a page on all the botanical and some horticultural detail. If you are interested in pleurothallids you must have this. Very rare.