Author:Alfred Bray Kempe
| Alfred Bray Kempe (1849–1922) |
| Ọkà mmụta mgbakọ na mwepụ Britian |
Ọrụ ya
[edit]- "On the Geographical Problem of the Four Colours", page 193, American Journal of Mathematics Vol. 2 (1879)
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Works by this author published before January 1, 1931 are in the public domain worldwide because the author died at least 100 years ago. Translations or editions published later may be copyrighted. Posthumous works may be copyrighted based on how long they have been published in certain countries and areas. |