Formation Petronella - tandem 56
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According to notes at the end of <<ddpub:Bankhead Book Part 2#764>> <<ddp:Drewry, John#108>> writes that Petronella in Tandem was first used by <<ddp::Boyd, Iain#173>> of Wellington, NZ and <<ddp:Boehmer, Marie#35>> of Ontario, Canada. However the name was assigned by Drewry.
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