We have in our office , where you can read about , but I do not remember where. I also exhibited links on conservation schedules. And in general. Need to buy cardboard, white , they are called backs . That you will be ideally podlozhka.V can buy special corners, they are sold in the home photos and size of the works themselves fixed on the substrate. So you can also use fish glue. Top cut mat, and also to fix. So I kept at 40-50 sheets each other. Even if they are of different size , it still may all be the same size, so easy to store . Well, like everything. Maybe somebody else prompt others.
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