Winkler, A. (ed.) — Catalogus coleopterorum regionis palaearcticae.

1924-1932 In two volumes (complete). Double title pages, viii, 1698 p., later uniform black cloth, with gilt title on spines. The basis for every palaearctic Coleoptera-study, listing nearly 9,000 numbered species, not counting the varieties, which are indicated by letters. This is the special "annotation-copy". In this copy, the pages are deliberately half blank, to create room for annotations. This copy, however, has none. Another edition exists, in which the text is printed in two columns without blanks. Such reference copies are only half as thick and have four page numbers on one leaf. A very good, clean set.