| William J. Waterman Roome | Herrmann Baumann | George Peter Murdock | Walter Hirschberg |
| 1923~1925 | 1940 | 1959 | 1965 |
| All four were qualified scientists of their time. Professors, Doctors, Engineers, Africanists, Ethnologists. |
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| Added together, they have analyzed thousands Africanists posts, scientific works and travelogues. | |||
| Their evaluations are all united in this database. Over 8440 tribes. Over 12.000 geographical thermes. | |||
| Placed together and in opposite. | |||
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