DescriptionRungs of ladders and chair (PSF).png English: Rungs depicted in ladders and chairs Date 16 August 2019 Source Archives of Pearson Scott Foresman...
DescriptionRungs of ladders and chairs (line art) (PSF R-790001 (cropped)).png Raw image from Pearson Scott Foresman donation Date 2 December 2007, 15:56...