Covering subjects from adventure and art to Zaire and zoology, documentaries span the widest range of special-interest video. As most titles target specific audiences, the documentary offers a unique challenge to supermarket video merchandisers looking for popular product. duces the "Biography" line. It's no surprise, then, that several recent popular titles are Titanic-related. A&E's four-volume Titanic boxed set is the company's biggest seller to date, according to Bushnell, even ...

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