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21
Hopper, Paul J., 701.1-H798t-V.1
| D.Reidel Publishing Company |
1982
701.1-H798t-V.1,
22
Hopper, Vincent F., 841-H798i
| Barron's Educational Series |
1987
841-H798i,
23
Hopper, B. J., 421.112-H798우
| 21세기교육사 |
1998
421.112-H798우,