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letter-box
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mail-box
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pillar-box
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postboxes
11 years ago|2 views|share |citing 
APASmart Define. (2015). letter box thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/letter_box/thesaurus/related
ChicagoSmart Define. 2015. "letter box thesaurus" https://smartdefine.org/letter_box/thesaurus/related (accessed September 26, 2026).
HarvardSmart Define 2015, letter box thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/letter_box/thesaurus/related>.
MLASmart Define. "letter box thesaurus" 13 April 2015. Web. 26 September 2026. <https://smartdefine.org/letter_box/thesaurus/related>