_More Maxims of Mark_, published by Merle Johnson in 1927 is the only source for a number of specific Twain quotes. Johnson, at one time, had access to a number of Clemens's unpublished journals and other writings. Tracking the originals that were once in Johnson's possession and verifying them is a project that I don't believe has ever been fully undertaken. Some of the collectors or other editors on the Forum may be able to offer you more insight into a number of the activities Merle Johnson was involved in and how he conducted his business. Barb