Ursus Books (New York)
[Stock catalogues, numbered series: 260] Catalogue 260
New York, Ursus Rare Books, 
(28 cm),  pp., illustrations (most in colour). 97 items; priced. Publisher’s pictorial wrappers. - Includes a late sixteenth century illuminated Prayerbook for the Imperial court of Rudolf II (item 79, $450,000); re-offered by Ursus, Catalogue 321: Rare Books 1475-2010 (2014), item 16. The undated catalogue is noticed in The Book Collector, Winter 2006, pp.577-578.