DD may want to put this in the "References" thread under "books online." I saw an "internet" section there but that seems to link to articles, since we've now had a few postings of entire, classic artillery books online, maybe this merits a new section in the locked "references" thread?
This could already be listed there and I missed it, but I did check. This book was listed as a title, but the link to the online version should be included as well.
I think as minimum, the "online books" section should include this, the Tidball Heavy Artillery book mentioned recently, and the Abbot book also mentioned recently.
I've probably used this particular book more than any other one I have, since it has so much information in such a concise form:
http://www.nps.gov/history/history/online_books/source/is3/index.htm