(plural PO boxes)
Normally written PO Box when used as part of an address.
"po-box." YourDictionary, n.d. Web. 05 December 2018. <https://www.yourdictionary.com/po-box>.
po-box. (n.d.). Retrieved December 05th, 2018, from https://www.yourdictionary.com/po-box
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