[Bydgoski Klub Miłośników Kaktusów, Vademecum kolekcjonera kaktusów (kaktusy mrozoodporne), Bydgoski Klub Miłośników Kaktusów, Bydgoszcz, 2002, 12 s.]
Bydgoski Klub Miłośników Kaktusów, Bydgoszcz, February 2002. Archived comparisons. Their temperatures are not treated as verified thresholds for species identified today.
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