The so-called "sketchbook" of Villard de Honnecourt (more correctly, an album or portfolio) dates to about c.1225-1235. It was discovered in the mid-19th century and is presently housed in the Bibliothèque nationale de France (BnF), Paris, under the shelfmark MS Fr 19093. It consists of 33 parchment sheets measuring on average 235x155 mm, or 9.25 x 6.1 inches.[4] The manuscript is not complete, and its original extent cannot be determined.