Columbia subject headings:
Harvard subject headings:
Dead Sea (Israel and Jordan)--Discovery and exploration.
Dead Sea (Israel and Jordan)--History--19th century.
Imperialism and science--Dead Sea (Israel and Jordan)--History--19th century.
Tigris-Euphrates Delta (Iraq and Iran)--Discovery and exploration.
Tigris-Euphrates Delta (Iraq and Iran)--History--19th century.
Princeton subject headings:
Dead Sea (Israel and Jordan)--Discovery and exploration.
Dead Sea (Israel and Jordan)--History--19th century.
Imperialism and science--Dead Sea (Israel and Jordan)--History--19th century.
Tigris-Euphrates Delta (Iraq and Iran)--Discovery and exploration.
Tigris-Euphrates Delta (Iraq and Iran)--History--19th century.