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They provide information that customer needs, but still easy to read and understand because they are usually short enough. Some printing services have also established their own recycling setups to reduce costs and pass these savings on to their customers. If you use one of these companies, remember to mention it on your brochure, as it will surely impress your customers.
Brochures at http://cranstonmanuel.hubpages.com/hub/Brochure-Designing-to-Brochure-Printing-101