American Mahjong is played several genuinely different ways around the world. Learning three rule systems at once, from three different sources, is the fastest way to get confused at an American table.
“This book teaches American-style Mahjong rules only. No Chinese, Riichi, or regional-diaspora rules are mixed in.”
Every diagram in the book uses one tile set and one notation system (taught in Chapter 3), so a hand written on page 40 reads the same way on page 200.