Thanks for all your responses! I am NOT a Calibre proficient person, but am slowly forced to learn more than just put my books in and retrieve when I want one!
I am in the process of "adding" the rest of those files in the folder. Now I have found three other file folders full of books (folders under different names, of course)! The largest one is called Copy of Library and it contains more files than the Calibre Library file folder. So I'll need to get those "extras" added, also.
Is there an easy way to add those books within the other file folders without adding duplicates that undoubtedly exist or do I just use "add"? If so, then I can do that to the other two folders, just to be sure I have everything together!
I thank you all so very much for your time and efforts in helping me!!