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 | PRODUCT UPDATE NOTICE QUARTERLY DATAFILE UPDATE INFORMATION PRODUCT: ZIPSOURCE (GEOGRAPHIC DATA FILE (GDF)) RELEASE: DECEMBER 31, 1997 PREVIOUS UPDATE: SEPTEMBER 30, 1997 COMMENTS: ZIPSOURCE is provided as a fixed block sequential file. Please use in-house utilities for installation. UPDATE SUMMARY: The following are an estimate of the changes for this release: 
 NOTE: This release also contains changes to area codes, 
 Any change in contact names or addresses should be forwarded to our Shipping 
Department at the address shown below. | 
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