I question the longevity of most books issued in these days, but I am never in doubt about these rag books; they are immortal.
1997, Maurice Saxby, Books in the Life of a Child[2], →ISBN, page 177:
I have a warm and happy memory of my own well-washed and well-thumbed rag book with its picture of Spot the dog, a chicken, a spinning top and building blocks. Certainly a rag book should be washable and non-toxic.
2003, Leyla Maniera, Christie's Century of Teddy Bears[3], →ISBN:
The company specialized in indestructible rag books 'for children who wear their food and eat their clothes', an attitude symbolized in its trademark depicting two dogs fighting over a rag book.