How do you review an indispensable classic? In 1981, Tom Simkin and colleagues at the Smithsonian Institution's Global Volcanism Project (GVP) published Volcanoes of the World. This was the first complete modern English language listing of volcanoes and their eruptions, and it became the fundamental reference for such information. In 1994, Simkin and Lee Siebert published a second edition, which adds 170 volcanoes, 2322 eruptions, and hundreds of references and corrections to the first edition. The value of this compilation is indicated by the fact that even though it is now 6 years old, it warrants a review in Eos!