One problem w/ Google books is they don't yet accept that anything published by the federal government has no copyright. There are gobs of ICC, Army Corp of Engineers, and Bureau of Mines books in their listings -- all of which have useful and interesting RR information, such as carloadings -- but none of which is revealed beyond a single paragraph.
I've written to point this out and the reply I got was along the lines of "We're trying to be real careful".
