Generated Graph Paper
LinuGraphy (Guideline Generator in pen nib widths with vertical lines option)(pdf)
Printable Protractor (for pen angles) (pdf)
Keith Enevoldsen’s Think Zone
Writing & Illuminating & Lettering, (1917), Edward Johnston
Classic Text on Modern Calligraphy
Public Domain Facsimile in pdf format
Internet Archive, Canadian Libraries
Note: There are many suppliers, this is just a short list of my favorites.
John Neal Bookseller
Pens, Ink, Vellum, Quills, Gilding Supplies, Books
Dry pigments, Gilding Supplies, Paint, Mediums, Brushes
Daniel Smith Art Materials
Paint, Brushes, Dry pigments, Gilding supplies, Papers
Opus Framing (Canada only)
Pens, Ink, Paper, Paint
Currys Art Store (Canada only)
Pens, Ink, Paper, Gold Leaf, Paint
British Library Catalogue of Illuminated Manuscripts
Wonderful images and details of manuscripts.
Illuminated Pages of the Gutenberg Bible
Gutenberg Model Book (with English translation)
Guide for Drawing the Acanthus, and Every Description of Ornamental Foliage
by I. Page, c. 1886
Public Domain book from Google Books with a pdf. Targeted more towards architecture but has beautiful engraved illustrations and interesting techniques.
The International Association of Master Penmen, Engrossers and Teachers of Handwriting (IAMPETH).
Calligraphy and Pointed Pen styles and techniques – Handwriting, Engrossing/Copperplate, Ornamental Penmanship, Spencerian, etc.