[R] combining two data frames (different question)

[calundergrad]

i have two data frames.  One data frame contains one column with the
identificication number of a geographic place.  The other columns are just
some data about the corresponding geographic place.  The other data frame
also contains one column with the id number of a geographic place.  the
other columns of the second data frame is other data about the corresponding
geographic place.  

I want to make one data frame which has the id numbers and the corresponding
data from both the first and second data frames.  

how do you do this?
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