Pete,

There is one book in Swedish that contains much material originally in French. That book is: Valloner -- järnets människor by Anders Floren and Gunnar Ternhag. Gidlund Publishing House, ISBN 91-7844-3334. It contains many references in French and English. Here are a few.

Andre, G. 1966, "Les Wallons en Suede." Au pays des riezes et des sart, Nr 28, pp 285-293.

Bogaert-Damin, A. 1967. La metallurgie dan le Namurois. 1764-1814. Etude economique et sociale. Louvain: Universite catholique de Louvain (unpub doctoral thesis).
and
Bogaert-Damin, A. 1977. L'industrie du fer du XVIe siecle a 1815. Paris

Some in English too.
Eklund, Å, Evans, Chris & Ryden, Göran 2000."Graffin Prankard and Francis Jennings in a network of goods and capital. The Anglo-Swedish iron trane in first half of eighteenth century." Paper presented at Fifth International COnference on Urban History, Berlin, 2000.

Evans, Chris & Ryden, Göran 1988. "Kinship and transmission of skills: bar iron production in Britain and Sweden, 1500-1860. Technological Revolutions in Europe. Berg, M & Bruland, K. (eds). Cheltenham: Edvard Elgar. pp 188-206.

I will look through reference lists in a few other books for possibly useful citations. Perhaps some of these will provide you a reference trail with useful new informations.

Niklas