Bibliography:
ASD editor. "A Profile of Marcel Triau" . American Dowser. vol. 11, no.4 (Nov., 1971), pp.185-188;
ASD editor. "Positive Feedback on the French Coil". American Dowser. vol. 24, no.2 (May, 1984), p. 41 feedback by Susan Montrose
Brandes, Allen. The French Coil Revisited. Presentation at the ASD Conference, Danville, VT, 1991;
Happel, Richard V. "ESP for H2O". The Berkshire Eagle, Aug 9, !969, p.49; mentions Marcel Triau.
Triau, Marcel. "French Coil Dowsing Method Controls Fruit Tree Pests". The Bee Line, vol. 27 (Summer, 2007), p. 13.
Triau, Marcel. edited by Claudette Juneau. "Electro-Agriculture - A System of Pest Control". probably some issue of the Americn Dowser in the 1970's, since Triau died in 1977.
Researchers and users of the French Coil:
Anderson, Richard Feather: https://dowserswestcoast.wordpress.com/tag/french-coil/www.richardfeatheranderson.com
Montrose, Susan J. P.O.B. 600, Burney, CA 96013. user of French Coil; gave positive feedback in 1984;
Triau, Marcel. (1900-1977): researcher and manufacturer of French Coils since the 1950's. Lived in Pittsfield, MA.