Volo's Guide to All Things Magical (in-universe)

Volo's Guide to All Things Magical was a vellum pamphlet written by Volothamp Geddarm in late 1369 DR and published by Tym Waterdeep Limited

Description
The guide was full of long-forgotten spells and a grab bag full of odds and ends about magic.

Controversy
Several powerful mages, including Elminster would have preferred the spells and secrets in the guide remained unknown to the general public. All copies were hunted down and destroyed.

Re-Release
In 1367 DR, a second pamphlet of the same name was released. This version, now named Volo's Guide to all Things Magical, the Revised, Authorized & Expanded Edition was extensively rewritten and edited by Elminster.