| Artist | Titles | 1.
| Niehaus, Charles Henry, 1855-1935, sculptor. | 128 | 2.
| Niehaus, Charles Henry, 1855-1935, sculptor. (attributed to) | 1 | 3.
| Niehaus, Charles Henry, 1855-1935, sculptor. (possibly by) | 1 | 4.
| Niehaus, Karl H., 1855-1935, sculptor. | 0 | 5.
| See: Niehaus, Charles Henry, 1855-1935, sculptor. | 128 | 6.
| Nielsen, Henry Luckow, sculptor. | 1 | 7.
| Nielsen, Jack, 1947- , sculptor. | 4 | 8.
| Nielson, Henry Luckow, sculptor. | 0 | 9.
| See: Nielsen, Henry Luckow, sculptor. | 1 | 10.
| Nielson, John Alexander, 1881-1954, painter. | 18 | 11.
| Nielson, Stuart, sculptor. | 3 | 12.
| Niemco Fabricators, fabricator. | 1 |
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