File:Alternating stair tread.jpg

Alternating_stair_tread.jpg(614 × 376 pixels, file size: 73 KB, MIME type: image/jpeg)

Alternating stair tread. Image source

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current15:19, 2 October 2015Thumbnail for version as of 15:19, 2 October 2015614 × 376 (73 KB) (Talk) (Alternating stair tread. Image source

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