Using Access 2003  Trying to join the following two tables:

TABLE 1- this is a reference table that lists census block groups and 
associated zip codes within a geographic region.  For every 
censusblocknum there is one zipcode.  For every zipcode there is one or 
more censusblocknum.
 FIELD 1 (text)    FIELD 2 (text)
 censusblocknum    zipcode

TABLE 2- this is a data table that lists census blocks that meet a 
certain criteria accompanied by a value.  
 FIELD 1 (text)   FIELD 2 (text)    FIELD 3 (number)
 censusblocknumA  censusblocknumB   numcommutes

RESULT DESIRED-assignment of the correct zipcode (from table 1) to the 
rows in each of the two censusblocknum columns of table 2:

censusblocknumA zipcodeA censusblocknumB zipcodeB numcommutes  

Thanks for your help

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