Some feather types

[Traditionalist]

http://www.chooks.biz/2012/01/feather-types-and-markings.html

[daring duffer]

Thank you, Mike.
Interesting.

[Highlander]

Been done before here but for those that have not seen it an interesting & more importantly a useful site.
http://www.federn.org/federn_en.html
A good book if somewhat dated is.
The Book of the Hackle.... Frank Elder ( A history of hackles)
ISBN: 7073 0223 4
Having said that there is nothing I know off in print today that comes close so dated is not maybe the best word.
Tight Lines