Columbia subject headings:
Tsunami damage--Japan--Sanriku Region--History.
Tsunamis--Japan--Sanriku Region--History.
Tsunamis--Japan--Tōhoku Region--History.
Harvard subject headings:
Tsunami damage--Japan--Sanriku Region--History.
Tsunamis--Japan--Sanriku Region--History.
Tsunamis--Japan--Tōhoku Region--History.
Princeton subject headings:
Tsunami damage--Japan--Sanriku Region--History.
Tsunamis--Japan--Sanriku Region--History.
Tsunamis--Japan--Tōhoku Region--History.