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Indexing
Lexicon of Canadian Geological Names on-line
Lexico Estratigrafico de Mexico
Suggestions to Authors of the Reports of the United States Geological Survey
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LC
Classification Web (subscription)
OCLC
OCLC Bibliographic Formats and Standards
MARC
MARC 21 Format for Bibliographic Data
MARC Code List for Geographic Areas
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RDA
Library
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