Am trying to merge about 15 .csv tables - tried a test run but came up with
0 rows (no data for each variable/column head)

> CAHSEE.EA.feb.2009<-read.csv("2009 CAHSEE EA feb 2009.csv", header=TRUE)
> CAHSEE.IM.MATH.2009<-read.csv("2009 CAHSEE Impact Math.csv", header=TRUE)
> testmerge<-merge(CAHSEE.EA.feb.2009,CAHSEE.IM.MATH.2009)
> testmerge
 [1] Grade          LocalStudentID MathPassed     MathScaleScore SchoolCode

 [6] LastName       FirstName      ELAPassed      ELAScaleScore
 MathTestDate
<0 rows> (or 0-length row.names)

I know several variables are shared in both sheets. Please advise.

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