Penpractice.com
The articles on the pens listed below  formed part of the book on Pen Repair that I authored jointly with Jim Marshall in honour of Arthur Twydle - the UK pen maestro.  They appeared originally in the Journal of the Writing Equipment Society.

The article on materials is in course of preparation.

References to significant work by other authors is included.
Contributions to this bibliography would be welcome.
Technical
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Ink Capacities
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Ford Patent Pen
Blackbird Top filler
Technical Articles:-
Stephens Button filler