UNE-EN 13850:2013 Postal Services - Quality of Services - Measurement of the transit time of end-to-end services for single piece priority mail and first class mail
2020UNE-EN 13850:2020 Postal services - Quality of services - Measurement of the transit time of end-to-end services for single piece priority mail and first class mail
2013UNE-EN 13850:2013 Postal Services - Quality of Services - Measurement of the transit time of end-to-end services for single piece priority mail and first class mail