BigDog gave you a good piece of advice... with the sheet protectors.. however.. need to elaborate on that.
With older paper.. even as young as say 50 years.. they are subject to aging. At one time archival materials were in the realm of archivists and other restorers only. However, Xerox came out a few years ago with a new product that was archival safe sheet protectors.. they were expensive. Now, many generic versions are now available at Staples, Office Depot, Office Max.. etc.. and are relatively inexpensive.
They are the perfect solution to your problem..
Here is an example Archival Safe Sheet Protectors
at Office Depot.