Creating A SQL Statement Store Procedure

I'm trying to do this:

CREATE PROCEDURE [dbo].[spStoryDisplay]

-- Add the parameters for the stored procedure here

@clsYear int

AS

BEGIN

-- SET NOCOUNT ON added to prevent extra result sets from

-- interfering with SELECT statements.

SET NOCOUNT ON;

-- Insert statements for procedure here

SELECT *, "Class Year" =

CASE

WHEN year1 >= 1940 AND year1 < 1950 THEN '1940s'

WHEN year1 >= 1950 AND year1 < 1960 THEN '1950s'

WHEN year1 >= 1960 AND year1 < 1970 THEN '1960s'

WHEN year1 >= 1970 AND year1 < 1980 THEN '1970s'

WHEN year1 >= 1980 AND year1 < 1990 THEN '1980s'

WHEN year1 >= 1990 AND year1 < 2000 THEN '1990s'

WHEN year1 >= 2000 AND year1 < 2010 THEN '2000s'

END

FROM dvlStory

WHERE "Class Year" = @clsYear

ORDER BY lstName ASC

END



I kept getting this error:

Msg 207, Level 16, State 1, Procedure spStoryDisplay, Line 27

Invalid column name 'Class Year'.
So, my question is, how do I compare to the additional column "Class Year" to the parameter?