DRER, ALBRECHT. Etliche underricht zu befestigung der Stett, Schlosz, und flecken. Nuremberg: [Hieronymous Formschneider], October 1527. Gothic type, woodcut initials, large woodcut arms of Ferdinand I on title, 20 woodcut diagrams or illustrations, including 13 on 10 folding leaves, most titled on the block. Folio, modern pigskin, washed, repairs to margins of most leaves with some loss of text or illustration to 4 leaves. FIRST EDITION, without the errata leaf and extra plate sometimes present. "A practical work dictated by the fear of invasion by the Turks... as well as summarizing the science of fortification it contains some of Drer's chief architectural work" (DSB). Brunet II:913. Fairfax Murray German 151; Stillwell Science 835.