Today I received a late Christmas present which had been ordered from Canada by my daughter's boyfriend. The present is TWO books, Volume 1 and 2 on the "Steel Square and it's Uses". The books are copyrighted 1907. The first is 246 pages and the second is 243 pages. Almost 500 pages on the simple steel square.
In case you are interested, the author was William Radford, editor-in-chief of the "American Carpenter and Builder".