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21by Yamey Basil Selig, Benninger L.J, Hill N.K, Coomber Ronald Robert, Horsefield John Keith, Lemke B.C, Murphy Mary, Pollins Harold, Smith C.A, De Roover Raymond, Keister Orville R., Johnson Thomas
[s.n.] [1949-1983]Book -
22Arno Press 1978Book
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23by Pacioli Luca
Albrizzi 1994Book -
24by Peele James
Daigakudo Books 1979Book -
25Clarendon Press 1994Book