David,
From comments posted here and on or through other sites by people who profess to know about these things, the copyright situation of the Atlas (and Craftsman version) Manual of Lathe Operations is ambiguous for at least three reasons.
(1) the company is still in business today (as Clausing) with no breaks in ownership of the original name "Atlas".
(2) they still sell new copies of the most recent version (1982).
(3) the page (back side of the Title Page) of all versions contains a list beginning with 1937 and ending with the year/version of the then current copy. In between are listed all of the years/versions. The page makes no mention of Copyright or of a copyright start date for the copy. There is no statement identifying what the years shown actually mean (edition, etc.).
People who have or have seen copies of the book with different final years know that in general something changed each time that Atlas incremented or added the final year shown. Most of those who claim more than casual familiarity with copyright law have concluded that from a legal standpoint, the book might have never been "out of print".
The owners of the several Atlas-related sites I happen to be a member of have generally said (if the subject ever came up) not to upload scanned copies of any year to their sites (groups, forums).
On the other hand, I know of at least two eBay vendors who have been offering for sale hard copies of one or more years, although at least one has them ID'd by which machines are covered and not the print year. So far, at least, eBay has not pulled the ads. Whatever that means.
That all having been said, the general rule here on posting URL's to other sites has been not to do it if the owner of the other site objected. I'm a little puzzled by your third sentence. Why don't you send me the URL (PM, I guess) and let me take a look, and then ask the H-M owner what he thinks.
Robert D.