Numbers, Natural
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Broader term:Narrower term:Used for:- Natural numbers
- Numbers, Whole
- Whole numbers
- Natural number
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Mainly Natural Numbers: A Few Elementary Studies on Smarandache Sequences and Other Number Problems, by Henry Ibstedt (PDF at UNM)
- Sobre los Diferentes Sistemas de Numeracion y la Teoría de Numeros Primos: Lecciones Complementarias de Aritmética (in Spanish; Madrid: M. Minuesa, 1866), by Mateo Tuñón y Lara (page images at HathiTrust)
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