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| 005 | 20210219152801.0 | ||
| 008 | 991125s1980 usa 000 0 eng u | ||
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| 035 | _aUPN01000061097 | ||
| 245 | 0 | 0 | _aMONTESSORI OBSERVER |
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_aUSA : _bInternational Montessori Society, _c1980 |
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| 310 | _aBimestral | ||
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