..."Carnes, isn't this the darnedest thing we've ever been through?Captured half a mile underground by a race of giant talpidae beforewhose mental orders we are as helpless as children... 
Various 「Astounding Stories, August, 1931」
...That was to prepare the way for me, in case of need, among thevast army of those who work underground and know their chief but do not knoweach other...
John Buchan 「Mr. Standfast」
...” Then he told her about the Underground Railway—not ashe had told it to me, to scare, but as a proof of power and forethought...
John Buchan 「Mr. Standfast」
...But it might be difficult to carryan unwilling woman over the first stages of the Underground Railway...
John Buchan 「Mr. Standfast」
... He must have been whirled into the open below where thebridge used to be, and then swept into the underground deeps, where theLabongo drowses for thirty miles...
John Buchan 「Prester John」
...Then commenced a more or less underground existence, which continued for five and a half months; but, surrounded by friends, it was to me a perfect heaven after so many weeks passed amidst foes...
Lady Sarah Wilson 「South African Memories」
...He wonders much at the underground houses, and neverheard of them till I told him about them...
David Livingstone 「The Last Journals of David Livingstone, in Central Africa, from 1865 to His Death, Volume II (of 2), 1869-1873」
...Consequently, he availed himself of an Underground Rail Road ticket, and bade adieu to that hot-bed of secession, South Carolina...
William Still 「The Underground Railroad」
..." With the Underground Rail Road he was "highly delighted...
William Still 「The Underground Railroad」
..." Nevertheless, Richard felt that this Underground Rail Road was the "greatest road he ever saw...
William Still 「The Underground Railroad」
...But, notwithstanding all this weighing, measuring and requiring of bonds, many travelers by the Underground Rail Road took passage from Baltimore...
William Still 「The Underground Railroad」
...Accordingly he felt it to be his duty to try for Canada, via Underground Rail Road...
William Still 「The Underground Railroad」
..." So Jack looked to none of these "broken reeds" in Richmond in the hour of his trial, but to Him above, whom he had not seen, and to the Underground Rail Road...
William Still 「The Underground Railroad」
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