Alpha Portland Cement Company Blueprints and Concrete Plans These came in a folder that I found in an old box of maps and blueprints from an architect's estate.  Although not a book, they are in the public domain and interesting so I thought I would post some crude copies. I have not edited them or cleaned them up, and there is some loss to the margins on most of them because they were a bit too large for a scanner.   The actual plans are almost all there, though.  I figure anyone who is interested can clean them up after download if need be (although they are perfectly usable as they are now).   I have posted them at very high resolution (about 6500 by 4500 pixels) to preserve details and lettering. I gather this series, all from 1920-1920, was an effort by the Alpha Portland Cement Company to promote the use of concrete and cement in building.   I think I have almost a complete set here, but I have no definitive reference as to what plans were included. As always, these high resolution JPEG  images are all free of charge and ready to be downloaded one at a time or in bulk via a ...