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What is the best way is flatten Antique Maps? - antique map philippines

Does anyone know the best way, the old cards that will not spoil the flat map?
If less than 150 years, and I did not use a color of the iron in the past. But hit make older cards and little about the color?
Do you have a map of 1720 Seutter, with a slight bend, but it is in full color. Ideas?

So, if I do, it's there is a map or an atlas of the collectors who know how long-term store of maps and atlases in Canberra?
Thank you Rodger