...a thud, a leap—the back wheels had evidently crushed some very fragile obstacle... 
Vicente Blasco Ibanez Charlotte Brewster Jordan 「The Four Horsemen of the Apocalypse」
..."Dismount!" But before his rigid legswould allow him to do so, the horse fell flat, instantly dead, and thepicador was hurled over his ears his head striking the arena with aresounding thud...
Vicente Blasco Ibáñez Frances Douglas 「The Blood of the Arena」
... There was the sound of a dull thud, the crushing of heavy bone,and the sentry slumped into a silent, inanimate lump of clay...
Edgar Rice Burroughs 「Tarzan and the Jewels of Opar」
... There was the sound of a heavy thud, of a terrible scuffle there on the floor in the darkness and then a yell of victory from Collot d'Herbois...
Baroness Emmuska Orczy 「The Elusive Pimpernel」
...I felt the thud of his greatfeet pounding along, yet dared not move or look up lest he should seeme...
J. H. Patterson 「The Man-eaters of Tsavo and Other East African Adventures」
...If an appledropped from a tree in the village, its thud would beaudible from end to end of the little crooked streetin every cottage it would be known that an apple haddropped...
W. H. Hudson 「Birds and Man」
...Then the rest of the party heard the sound which Mahan's keenerears had caught a moment earlier—the thud of many marching feet...
Albert Payson Terhune 「Bruce」
...He heard not only the pounding of hisprey's heavy-shod feet, but the soft thud of hundreds—perhapsthousands—of other army shoes...
Albert Payson Terhune 「Bruce」
...As the first big drops struck withthe dull thud of leaden bullets about them, she went with him into thebalsam shelter...
James Oliver Curwood 「Baree, Son of Kazan」
...A dull thud, a rush, and arabbit goes rolling over and over entangled inthe purse...
Anonymous 「The Confessions of a Poacher」
...Then he pushed the tree with his foot, andit came out of the ground and fell with a loud thud...
Prince Sarath Ghosh 「The Wonders of the Jungle」
...We entered, and the door closed behind us with a soft thud...
Various 「Astounding Stories of Super-Science January 1931」
...Then there was a grating sound, anda thud as the stone doorway was rolled back into place...
Various 「Astounding Stories, April, 1931」
...The faint thud of horses' hoofs on the roadway made Tina and Larrydrop to the ground...
Various 「Astounding Stories, May, 1931」
...There came a swoosh through thenight, a dull thud, a blinding flash and roar that paled thesearch-rays into insignificance...
Various 「Astounding Stories, July, 1931」
...Before he could bestopped he had tackled the other guardand with a mighty heave flung himhalfway across the room where he fellwith a thud that left him dazed andgasping...
Various 「Astounding Stories of Super-Science, December 1930」
...The thud of a detonation deepin the earth came to their ears...
Various 「Astounding Stories of Super-Science, March 1930」
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