However, there isn't one specific "ABC book" that is universally known as the most famous.
Here's why:
* Wide Variety: There are countless ABC books published throughout history, targeting different age groups and focusing on various themes.
* Time Period: The most famous ABC book might vary depending on the time period you're interested in.
* Culture: The popularity of specific ABC books often differs between cultures and regions.
To help you find the most famous ABC book, please consider providing more context:
* What era are you interested in?
* What specific type of ABC book are you looking for? (e.g., traditional, modern, educational, illustrated, etc.)
* Is there a specific language or culture you have in mind?
With more information, I can provide a more accurate and helpful answer.