For years, I've bemoaned the fact that I have no central index for my large collection of cookbooks.  I decided to search the web to see if any anyone else had this problem, and perhaps a solution. I searched "cookbook indexes" and immediately found my answer here.  The answer is ingenious and I don't know why I did not think of it myself. It's as simple as creating a collection in Google Books (by scanning or typing in ISBNs) and searching within that collection. Many Google Book titles include the table of contents and index of a book, even ones still in copyright. What's more, in some, you can view and print entire pages  in the search results. 

     I was able to export a spreadsheet of all the books I'd already scanned into LibraryThing, including the ISBN. After deleting from the spreadsheet all but the cookbooks (by first sorting on the Tags column), I re-sorted on ISBN in order to separate those with ISBNs from those without them. I copy and pasted all of the ISBNs (as a column) into the box that Google Books provides for searching on ISBNs or ISSNs. When I ran the entire list against Google Books, some ISBNs were not found. I then redid the search in smaller batches of 20 books so I could check the hits against my spreadsheet and identify those missing hits. (Results list includes the title of each hit.)  Here is the resulting collection.  Alas, it cannot be sorted alphabetically by title or author, which sucks, but I suppose the presumption is that you should not need to so since you can search to locate book innards.
    It's a facinating event. To be able to ask the question, "Now which book had the turkey burgers with the jalapenos?" or "Where is the recipe for the African inspired chicken stew I made three years ago?"   I often use Epicurious, MealsMatter and Google for searching specific recipes or ingredients. They are lifesavers, to be sure. But I love cooking directly from an open cookbook with its spattered pages of meals remembered from years ago.