Books History 400-1450 (Topical Term)
- Earlier heading: Books History 400-1400
Wikipedia, Apr. 11, 2007 ("Around 1450, in what is commonly regarded as an independent invention, Johannes Gutenberg introduced movable type in Europe, along with innovations in casting the type based on a matrix and hand mould. This invention gradually made books comparatively affordable (although still quite expensive for most people) and more widely available")