Plain Concrete for Farm Use, by T. A. H. Miller 59379 [Full title: USDA Farmers' Bulletin No. 1279: Plain Concrete for Farm Use] [Link: http://www.gutenberg.org/5/9/3/7/59379 ] [Files: 59379-8.txt; 59379-h.htm] Thanks to Tom Cosmas compiled from images made available by The Internet Archive. Regards, Al