“Thành thạo về cách sử dụng xi măng”

Tài liệu tham khảo

• Helaman 3:6–7

  And now no part of the land was desolate, save it were for timber; but because of the greatness of the destruction of the people who had before inhabited the land it was called desolate. And there being but little timber upon the face of the land, nevertheless the people who went forth became exceedingly expert in the working of cement; therefore they did build houses of cement, in the which they did dwell.