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POST Class 17 contains papers on the mail handling cycle, from collection to delivery. The bulk of material relates to sorting and processing operations. The Class is divided into 19 series. Series 1 and 2 comprise sorting and circulation directories. Series 3-9 generally relate to mechanisation of processing and sorting operations, including development of mechanical aids and the postcode system, letter, packet and parcel sorting machinery, the Post Office Letter and Parcel Post Plans introduced in the late 1960s, new mechanised offices and environmental controls. Series 10-12 concerns the introduction and marketing of postcodes. Series 13 and 14 comprise papers and audit reports on operational organisation and efficiency. The next four series cover local authorities and postal addressing, various sorting methods, processing and sorting equipment, and delivery and collection methods. Series 19 comprises papers relating to general circulation issues.