This image was acquired from
flickr. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
smithsonian institution smithsonianinstitution usps mailman letter carrier lettercarrier postal employee postalemployee mail delivery maildelivery studio photography studiophotography american worker americanworker black and white photograph blackandwhitephotograph national postal museum nationalpostalmuseum mail across the commons