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Internet
| Brunold, Ursus. Planta, Konrad von. En: Lexicon istoric retic (bio.). Versiun da stampa 2008. |
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| Collenberg, Adolf. Planta, Leonarda von. En: Lexicon istoric retic (bio.). Versiun da stampa 2008. |
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| Dettwiler, Walter. Planta, Louis von. En: Lexicon istoric retic (bio.). Versiun da stampa 2008. |
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| Collenberg, Adolf. Planta, Ludwig August von [Wildenberg/Rietberg]. En: Lexicon istoric retic (bio.). Versiun da stampa 2008. |
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| Grunder, Hans-Ulrich. Planta, Martin von. En: Lexicon istoric retic (bio.). Versiun da stampa 2008. |
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| Bundi, Martin. Planta, Peter Conradin. En: Lexicon istoric retic (bio.). Versiun da stampa 2008. |
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| Hitz, Florian. Planta, Peter von (Fürstenau). En: Lexicon istoric retic (bio.). Versiun da stampa 2008. |
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| Simonett, Jürg. Planta, Peter von (Wildenberg). En: Lexicon istoric retic (bio.). Versiun da stampa 2008. |
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| Gredig, Hansjürg. Planta, Peter von. En: Lexicon istoric retic (bio.). Versiun da stampa 2008. |
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| Gredig, Hansjürg. Planta, Peter. En: Lexicon istoric retic (bio.). Versiun da stampa 2008. |
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