Orlando the Marmalade Cat

Orlando is a children's book (19 in the series) made between 1938 and 1972 by illustrator Kathleen Hale.
The most impressive aspect of the lithographs is how she has made them without a key line drawing, which must have been a nightmare to work out. I am trying to do a similar thing at the moment with a silk screen so she is a good person for me to look at.