[R] How to use macro variable in a text string

[kxk]

I want to use read.table to input many files, each for a different year.  I
would like to use the macro variable 't' to refer to the exact file that I
would like to input the data using read.table.  How could I do this?  Thank
you!

for (t in 1970:2005)
{ edge <- read.table(file="edge_t.csv", header=T,  sep=",")
## I will  have many rows of code following the read.table line 
}

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