1592952998000 1312632483000 term-26981 1616540988098 1312632517000 1616290216328 adlib fitz-online adlib-term-26981 0d85e701-bebc-3c84-9b5e-4d5d211d4f75 2 1 prospection, magnetic prospection, magnetic term reference term-26983 adlib-term-26983 95490a6c-2985-3521-81da-42ca3b0c9f63 magnetic surveying