Which German island was traded for control of Zanzibar by Great Britain in 1890?
British Administration of Heligoland Hellgoland Helgoland Helgioland Helgoland Power Cable Island of Helgoland Heligoland British Heligoland
island of helgoland helgoland power cable helgoland heligoland british heligoland hellgoland british administration of heligoland helgioland
heligoland
WikipediaEntity
Heligoland