Data Verification

Hi.

I have two worksheets. The first is a bit messy due to user error when inputting. It looks something like this

Line             Description
001              Bananas
001              Bananass
001              Baaannaaas
002              Cheese
003              Green things.

I need to correct these descriptions with the second worksheet data which has the accurate description for all lines, for example:

Line             Description
001             Bananas
002             Blue Cheese
003             Lettuce

To manually correct all of the first sheet would be a tedious task as there are a good 18-19 thousand rows of data.

I should mention the first sheet is a 97-03 spread sheet and the second is a 07 excel spread sheet (as the second as over 100 thousand rows of data)

How can I do this?