Is "Four Marbles of Geography" a fake book?

Introduction to the Four Marbles of Geography: Zhang Jiuyi was a famous geomantic scholar in the early Qing Dynasty, who studied geomantic omen in Tianxing, Lai Buyi, and was a geomantic researcher. Four Marbles of Geography is one of his representative works.

Including iron marble geographical element machine, gold marble pearl sutra of geographical element, jade marble geographical element pivot and lead marble geoscience essentials. The four geographical marbles are the magic weapon of the geomantic omen of the stars from ancient times to the present, and the criterion for scholars to report to the world. Geomantic omen practitioners of all ages did not learn for the sake of learning.

Zhang Gong's knowledge has been fully revealed in his works, but the secrets of Feng Shui can't be revealed, so there are still some ambiguities on important points, and sometimes the meaning is intentionally reversed. Therefore, it is difficult for a wise person to learn real knowledge from books without making efforts. Of course, if they really study hard, they can certainly understand the highest state of Feng Shui operation from books. The geographical illustration "Four Marbles" edited by Liu.