| http://www.w3.org/ns/prov#value | - You have to make your own, as they are not commercially available, in part because boxes are so variable. (Bluebird Loves, which is apparently out of business, used to sell one designed especially for their box.) If you have a Jack Finch box with a metal roof, Horace Sher suggests a 3 x 4piece of cardboard fit in between the metal roofcover and the actual roof.
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