Lost bookmarks. I unwittingly deleted the bookmarks in the "recently bookmarked" folder. I did not know that this also deleted the same bookmarks located in my bookmark folders. Where do I go to get them back?

I was using the Show All Bookmarks and tidying up some of the older ones that I did not use anymore. Under the folder "Recently Bookmarked" were urls that I had saved under their appropriate folders. So, being tidy, I deleted them, thinking they were duplicated. Now I find that the bookmarks that had been under my various folders have all gone. Implication is that by deleting the contents of "Recently Bookmarked" I took out ALL references to the urls, not just a duplicate record. I want to know how to find them - they are not in the Windows recycle bin.