I used Column D to store our cost of materials then I referenced it in some
formula's in Columns G & H but I screwed up.

I hid Column D before generating a hardcopy and then I quit Excel with
Column D hidden!

Though Columns G & H still hold the correct values and still refer to Col D,
I am not able to restore it to make additional changes and I don't necessary
want to reinput all the data. UNDO does not work and Tools-Options-View
doesn't either.

Can anyone tell me how to restore Col D?

Thanks a lot,

Carlos