Recto: On Timber, the Species of Trees (Vitruvius, Book 2, Chapter 9, no. 4); Verso: On Timber, the Battle of Larignium (Vitruvius, Book 2, Chapter 9, no. 15)..

1530–45

Pen and dark brown ink

15 × 26.4 cm (5.9 × 10.4 in)