The National Library's collection holds many miniature books measuring less than 10cm.
Traditionally, two prefixes to call numbers have been used to identify miniature books in the collection. These are 'rbmin' and 'rb min'.
The smallest book in the Library's collection is significantly smaller than the 1930 book pictured above. Our smallest book is titled The smallest book in the world = das kleinste Buch der Welt, and measures 2.9 x 2.4 mm. It was created by German typographer Josua Reichert in 2002.