Much of this documentation is in the form of illegal ( but widely available ) bootleg recordings .
Much of this documentation is recounted in the book Get Back : The Unauthorized Chronicle of the Beatles ' Let It Be Disaster by Doug Sulpy and Ray Schweighardt .
Much of this documentation is in the form of illegal ( but widely available ) bootleg recordings , and is recounted in the book Get Back : The Unauthorized Chronicle of the Beatles ' Let It Be Disaster by Doug Sulpy and Ray Schweighardt .