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MDPI Books uses a print-on-demand service. Your books will be printed and delivered directly from one of our print stations. Generally, we use premium shipping with an estimated delivery time of 5–12 business days. Items arrive in separate packages if you have placed an order containing books from the Library and from our Book Builder. These packages may arrive at different times. P.O. Boxes cannot be used as ship-to address. Because we print and ship books on demand, returns are not accepted.