Sentence:  Cardboard noisemakers , substitutes for the unavailable tin models , were being hawked and bought at makeshift stands every few <WSD>yards</WSD> along Broadway , and one 's ears were continually serenaded by the horns ' rasps and bleats . 
Meaning of the word marked with <WSD> tags:  a unit of length equal to 3 feet; defined as 91.44 centimeters; originally taken to be the average length of a stride