Reference

As of the latest information available, there are 17 volumes in The Bootleg Series collection by Bob Dylan. This information is supported by various sources including Wikipedia's Bob Dylan discography page and Vulture's article titled "A Beginner's Guide to Bob Dylan's Sprawling Bootleg Series." Here is an image of the cover of "The Bootleg Series Volumes 1-3 (Rare & Unreleased) 1961–1991", which is the first release in the series: .