Konkrece
© Bokr, Pavel | 2000
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Levín - Lucberk
© Bokr, Pavel | 2000
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Markazitová konkrece v jílovci
© Bokr, Pavel | 2003
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Pyritové konkrece
© Bokr, Pavel | 2003
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Konkrece
© Bokr, Pavel | 2005
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Konkrece
© Bokr, Pavel | 2005
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Lom Kosov u Berouna
© Bokr, Pavel | 2005
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Konkrece
© Bokr, Pavel | 2005
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Markazitové a pyritové konkrece
© Bokr, Pavel | 2006
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Sideritová konkrece
© Bokr, Pavel | 2007
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Konkrece
© Bokr, Pavel | 2007
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Konkrece
© Bokr, Pavel | 2007
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Vápnité konkrece
© Bokr, Pavel | 2008
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Manganové konkrece ze dna oceánu
© Bokr, Pavel | 2008
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Konkrece
© Bokr, Pavel | 2009
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