Southwestern Bell Telephone Price and Demand Dataset
rate detail notes

2001, ln 8: corrected apparent error in prev (lead digit 1 too high)

2006, interexchange basket: prev=demand, but prate=crate, so set prev=crev

2009: revenue discrepancies from rounding in data on source spreadsheets

1999: no state or zone codes, except for interexchange basket

1998, both filings, 118 duplicate records per filing in trunking, state=KS, zone=3, MLC, first set has positive demand and revenue; second set has zero demand and zero revenue

2004, ln 6729: -2.9 million for "OC SONET CANCELLATION CHARGE- SPECIAL" (negative value verified in source archive)

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The Southwestern Bell Telephone Price and Demand Dataset is available at:
http://galbithink.org/telcos/southwestern-bell/sw-rate-detail-readme.htm