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"Factors Affecting Extension Ladder Angular Positioning."
Peter I. Simeonov et al. (2012)
- Peter I. Simeonov, Hongwei Hsiao, In-Ju Kim
, John R. Powers, Tsui-Ying Kau:
Factors Affecting Extension Ladder Angular Positioning. Hum. Factors 54(3): 334-345 (2012)
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