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Ivor Kitchener has done a History of Multi-layered Collerettes.  To read this fascinating paper, please click on the link below.
History of Multi-Layered Collerettes
 
Dr Mike Bryant and Ivor Kitchener have done a detailed study into the Hybridisation of Collerettes.
This significant document is too large to view in a single file over the internet - it would take a very long time to download!
I have split it into 11 parts.  Each part can be downloaded individually.  They are listed below.  To view, just click on the part you wish to read.
 
2009 hybridisation study part 1
2009 hybridisation study part 2
2009 hybridisation study part 3
2009 hybridisation study part 4
2009 hybridisation study part 5
2009 hybridisation study part 6
2009 hybridisation study part 7
2009 hybridisation study part 8
2009 hybridisation study part 9
2009 hybridisation study part 10
2009 hybridisation study part 11