1990 CTPP--SUMMARY LEVELS AND GEOGRAPHIC CODES USED IN PART 2
              
(Universe: Persons working in the CTPP region)              

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                                   -----------------GEOGRAPHIC CODES USED-----------------------
SMLV                                     STUDY                            MSA/    
CODE --SUMMARY LEVEL DESCRIPTION-- REGION AREA CBD STATE COUNTY MCD PLACE CMSA PMSA TRACT BG TAZ
              
950  CTPP Region . . . . . . . . .   *             
960  CTPP Region-MSA/CMSA. . . . .   *                                     *    
965  CTPP Region-CMSA-PMSA . . . .   *                                     *    *   
980  CTPP Region-Study Area(1)/
       Remainder of Region . . . .   *     *           
984  CTPP Region-CBD(1). . . . . .   *          *         

-----Only one from the following group of three summary levels will be present in each CTPP-----

990  CTPP Region-TAZ . . . . . . .   *                                                        *
992  CTPP Region-State-County-MCD-             
       Place/Remainder-Tract . . .   *               *     *     *    *               *  
994  CTPP Region-State-County-MCD-             
       Place/Remainder-Tract-BG. .   *               *     *     *    *               *   * 
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Note: Asterisks indicate which geographic codes appear on the records for each summary level.


Abbreviations Used:
                    BG   - Census Block Group
                    CBD  - Central Business District
                    CMSA - Consolidated Metropolitan Statistical Area
                    MCD  - Minor Civil Division
                    MSA  - Metropolitan Statistical Area
                    PMSA - Primary Metropolitan Statistical Area
                    TAZ  - Traffic Analysis Zone


(1) These summary levels were created only if requested, and may not be present in some CTPPs.
