36 CFR §1254.38

1. (a)You must keep unbound documents in the order in which we deliver them to you.
2. (b)You must not attempt to rearrange documents that appear to be in disorder. Instead, you must refer any suspected problems with the records to the research room attendant.
3. (c)You may use only one folder at a time.
4. (d)Remove documents from only one container at a time.