The Örnen

In July of 1897, a team of three Swedish men, led by Swedish engineer Salomon August Andrée, climbed aboard the Örnen, a hydrogen balloon set to fly over the north pole in one of the first attempts to explore the Arctic by air. Almost as soon as they set off things began to go awry, and the ill-fated expedition became one of Sweden's greatest mysteries.

Sources:

The North Star, Thu, Oct 02, 1930 ·Page 2

The Cincinnati Enquirer Wed, Sep 10, 1930

The Buffalo News, Wed, Sep 10, 1930

The Philadelphia Inquirer, Sun, Nov 16, 1930

The Long Beach Sun, Sat, Sep 20, 1930

Oceanwide expeditions 

The North Star, Thu, Oct 16, 1930 ·Page 6

Karolinska institute

Grenna Museum

Balloon.org

Neworker

The Washington Herald, Sun, Nov 16, 1930