A "hollow earth/lost race" story, published in 1901, by sf and western writer Robert Ames Bennett, 1870-1954.
The plot concerns a group of explorers who fly in a balloon to the North Pole, where they discover, via an opening, that the earth is indeed hollow.
The plot concerns a group of explorers who fly in a balloon to the North Pole, where they discover, via an opening, that the earth is indeed hollow.
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