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https://books.google.com/books?id=mUD5AuKCPLEC&pg=PA85&lpg=PA85&dq=ferdinand leenhoff&source=bl&ots=ZNQiH5K4qZ&sig=IQD1AISjOqRGgqGj3eANLxA0B1E&hl=en&sa=X&ved=0ahUKEwj3hf2k1-XJAhWFdh4KHTJvDBEQ6AEIdDAV#v=onepage&q=ferdinand leenhoff&f=false