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So named because they are fan-like indexes with pictures (like a field guide). A new concept in field guides, these 50-card decks are permanently bolted together at the base. Instead of opening it like a book, you fan out the cards to access the "page" you need. Tops of the cards are individually and ingeniously die-cut, providing a visual of each specimen. The body of each card functions as a complete chapter of the guide, containing information about it's particular subject. Because information is contained on the front and back of each card, there's actually quite a bit of information - the rough equivalent of a small field-guide page. A helpful index at the end of each helps you quickly find the card you need. Fandex topics appear below, but see our index for more specific information about each one.