Many of these are jute or hemp.
Others seem to be woven.
Many of them are dated in the 1970s---right before he died.
And some of this flatwork may be paintings or prints.
Seeing this one on the wall in the December House Beautiful made me go back and look at the Calder textiles. You get an idea of the scale here too. They are the essence of modernism----basic shapes, primary colors.