... CouldLaputa's trackers have got up with me already? But the sound was notof human feet... 
John Buchan 「Prester John」
...An army of black trackers had beenbrought in planes from all parts of thecountry, and they searched out thebeetle masses everywhere along thecourse that the invaders had taken...
Various 「Astounding Stories of Super-Science February 1930」
...He started again with two members of theWest Australia police force, Sub-Inspector Ord and Trooper Nicholson, andnative trackers...
Ernest Favenc 「The Explorers of Australia and their Life-work」
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