The Jewelry Arts Institute
MiniArt Supply: supplys for artists of miniature painting and other fine detail work
The Porcelain Enamel Institute
The ArtLex definition of "enamel"
The Wikipedia page on "vitreous enamel"
Miniatures at the Web Gallery of Art (old URL)
Miniatures at the Web Gallery of Art (new URL)
Bobbi Baldwin`s contact page
Otto Frei Jewelry Tools and Findings