Summary

1960: REFERENCE IS MADE TO YOUR LETTER OF OCTOBER 22. IT IS OUR UNDERSTANDING FROM YOUR LETTER AND INFORMATION FURNISHED INFORMALLY ( POST OFFICE DEPARTMENT REGIONAL LETTER. OR LATER) WILL BE AT THE DELIVERING OFFICE. WILL ALSO BE DELIVERED ON THE FOLLOWING DAY. OR ARRIVING FROM OUTSIDE THE AREA WILL ALSO RECEIVE THE MOST EXPEDITIOUS SERVICE POSSIBLE. A CENTRAL "CORE" CITY WITH APPROPRIATE SECTIONAL AND CONCENTRATION CENTERS ARE SELECTED WHICH TOGETHER FORM THE BASIS FOR DETERMINING THE SIZE OF THE AREA TO BE SERVICED CONSIDERING THE TIME REQUIRED FOR THE TRANSPORTATION OF MAIL BETWEEN SUCH POINTS. THE RADIUS OF THE AREA USUALLY INCLUDED IN A SECTIONAL CENTER IS EQUIVALENT TO THE DISTANCE TRAVELED BY A STAR ROUTE OR OTHER MOTOR VEHICLE IN FROM ONE TO TWO HOURS.