Signs I’d since altered

• The Dow and the Nikkei
• Textbook adjuncts
• Back-of-the-book readings
• Cookbooks have them
• The Dow and the Nikkei 225
• Alphabetical listings
• Book parts
• Back-of-the-book conveniences

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
according to OED, the plural form of index preferable in scientific and mathematical senses of that word.