School sketchbook, 60's sketchbook, yellowed paper, drawing paper, large sketchbook, artist's paper, old paper, aged paper
These are some old sketchbooks, with yellowed (from time) paper. Their cover is not hard (and there are 4 kinds of them, please ckeck photos). The paper is quite thin, and half of the pages remind of the glassine interleaves of the photo albums.
They measure 35 x 25 cm (13.8'' x 9.8'')
I think they would be perfect for artists who want to paint on naturally aged paper.