Cognomen Posnjak (Posnjak 
) , all over the world, is a very rare surname. The surname Posnjak is characteristic of Croatia, where it is quite a rare surname, Germany, where it is an extremely rare surname, and the United States.
| eugene w. posnjak U.S. geochemist at the Geophysical Laboratory, Washington, U.S.A. (b. 1888) |
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| gregor posnjak researcher |
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| gregor posnjak SI |
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