I would be interested to know how others, once they have found a recipe, then find the relevant book in a vast collection? How do you arrange your books, I have all mine in size order so they look neater. Sometimes I can spend 20 minutes looking for a book!!!
Some EYB members add a bookmark for each book's location: basement bookcase 1 (or 2, 3), living room bookcase, blue guest bedroom bookcase, etc. You could get more detailed to the shelf level too.
Sometimes I check the picture of the book on EYB - that can help to locate it in the bookshelves.
I generally know the location of my books. Very infrequently, it takes me more effort in locating but I find it within 15-30 min. I arranged them first by languages. For me, that would be Japanese and English. Then by methods or country. For example, all Greek, Hawaiian, German, Eastern European, Mexica, etc. I also keep all soups, salads, pastas, noodles, dumplings, desserts, breads, pizzas in their own area.
This is what I did - kitchen island, kitchen bookshelf etc. Unfortunately, not being supremely organized, I have a location called Missing
This is basically what I do, baking is a section, general cooking is section, holiday, etc. There is some overlap as there are Holiday baking books :). Other than if I have multiple books by an author I tend to keep them together.
And you have a search engine for ALL your recipes!