Recovering deleted collections in a group library
I know this topic has been covered several times, but I have a question about recovering accidentally deleted collections from a group library. I have a group library with several hundred members that we use for teaching a course once a year and don't use much in the interim. While preparing to teach next quarter, I realized that someone had (presumably accidentally) deleted a critical set of collections. I have no idea how recent this deletion was or who did it. Given that it may have been months since the deletion, is there any way for me to recover the collections? I know the files themselves are still there but they were in something like 30+ collections that I don't want to remake.