The difference between geographical four marbles and geographical lead bullets

Hello, what's the difference between geography four marbles and geography lead bullets? The difference between geographical four marbles and geographical lead bullets lies in their different ages. "Four Marbles of Geography" is a book published by Inner Mongolia People's Publishing House on 20 10 by Zhang Jiuyi. The representative work of Zhang Jiuyi, an ancient geomantic master, Geographical Bullet, a necessary book for studying geomantic omen, was published in beijing institute of technology press 16.