APA Style
Cram, Len. ().
Beautiful Opals: Australia's National Gem .
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Chicago Style
Cram, Len.
Beautiful Opals: Australia's National Gem.
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Text.
MLA Style
Cram, Len.
Beautiful Opals: Australia's National Gem.
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Text.
Turabian Style
Cram, Len.
Beautiful Opals: Australia's National Gem.
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Print.