[A DICTIONARY OF SPORTS 1835 https://books.google.co.jp/books?id=TvVhAAAAcAAJ&pg=PA62&lpg=PA62&dq=Brocklesby+Betty+Newmarket&source=bl&ots=Kg_qOrreoD&sig=ACfU3U2mNuAT2McWG5KRXJM72Eo-GvE2Lw&hl=ja&sa=X&ved=2ahUKEwjR5bGRvZDrAhWVHXAKHXWJD0sQ6AEwEHoECAgQAQ#v=onepage&q=Brocklesby%20Betty%20Newmarket&f=false]