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Of all human constructions the only ones that avoid the dissolving hands of time are castles in the air.Frederico De Roberto
Note: This is a collection of construction graphics that I've found on various pages on the Web. To grab an image, click and hold (right click in Windows) your mouse pointer on the image and select "Save this image as…" (Netscape) or "Copy image" (IE).
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Canadian and U.S. Highway Signs

Lockley.Net