Fortran Reading a specific column from .csv into fortran

Hi, I am using fortran to read specific columns from a .csv file. the rows in each columns are different, so I wish to read columns wise with a do loop. say, I wish to read from A1 to D20 initially(4 columns of 20 rows), then later f1 to h35 (3 columns, 35 rows). how do I read particular columns alone. thanks
 
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You have to read all columns and pick the one you want.
 

Vanadium 50

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You have to read all columns and pick the one you want.
True, but only one of them has to be an array.
 

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