Thank you for the prompt reply!
Something is wrong: I'm getting "#N/A"
The reference cells are not adjacent so I named each one and enclosed the string in parens.
Here's what I'm using:
=INDEX((Feb_04,Jan_04,Dec_03,Nov_03,Oct_03,Sep_03, Aug_03,Jul_03,Jun_03,May_03,Apr_03,Mar_03),MATCH(M AX((DD3,DM3,U3,AD3,AM3,AV3,BE3,BN3,BW3,CF3,CO3,CX3 )),(DD3,DM3,U3,AD3,AM3,AV3,BE3,BN3,BW3,CF3,CO3,CX3 ),0))
Perhaps this can not be done if the reference cells are not within a continuous range?