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Authors
- Nesi, Ruggero.1
- Neumann, R. O. (Rudolf Otto), 1868-1952, author1
- New York (State). Board of Health, author.1
- New York (State). Department of Health, author.3
- New York Filter Manufacturing Company, author.1
- Nogueira, Felix de Sá.1
- Novy, Frederick G. (Frederick George), 1864-1957, author1
- Noyes, Frederick Bogue, 1872-1961, author1
- Noyes, Isaac P., author2