| http://www.w3.org/ns/prov#value | - When using a more rigid material such as sheet metal, the clip may be proportionally shorter, with a minimum length of about one-quarter of the width of the top of the book, i.e. about 1 1/2 to 2 1/2 inches for a hardbound book and 1 to 1 1/2 inches for a paperback.
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