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Classification. Class Z, Bibliography and library science : adopted 1898 : as in force January 1, 1902
- "Bibliography"
- "Bibliography"@en
- "Classification. Class Z, Bibliography and library science : adopted 1898 : as in force January 1, 1902"@en
- "Classification. Class Z. Bibliography and library science. Adopted 1898. As in force January 1, 1902"