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Start Over Subjects Astronomical Objects ✖Remove constraint Subjects: Astronomical Objects Titles On the performance of a new form of level invented by Mr. John Clark of the U.S. Coast Survey ✖Remove constraint Titles: On the performance of a new form of level invented by Mr. John Clark of the U.S. Coast Survey Languages English ✖Remove constraint Languages: English

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  • On the performance of a new form of level invented by Mr. John Clark of the U.S. Coast Survey1