Columbia subject headings:
Harvard subject headings:
Excavations (Archaeology)--Germany--Laacher Lake.
Laacher Lake (Germany)--Antiquities.
Mines and mineral resources--Germany--Laacher Lake--History.
Tuffisites--Germany--Laacher Lake.
Volcanoes--Germany--Laacher Lake--History.
Princeton subject headings:
Excavations (Archaeology)--Germany--Laacher Lake Region.
Laacher Lake Region (Germany)--Antiquities, Roman.
Quarries and quarrying--Rome--History.
Stone industry and trade--Rome--History.
Volcanic ash, tuff, etc.--Germany--Laacher Lake Region.