Pigeonhole Corner Illustration. Figure 4,240, Page 1,784-238. Audels Masons and Builders Guide No. 1 1963 printing. Scanned from Authors copy.
Pigeonhole Corner Illustration. Figure 4,240, Page 1,784-238. Audels Masons and Builders Guide No. 1 1963 printing. Scanned from Authors copy.
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