The following modest list of links to online resources for string players may help you find some information that’s been eluding you. Suggestions for new links are welcome.
Museum Collections
Museo del Violino, Cremona, Italy
National Instrument Museum (Vermillion, SDak)–Bowed Strings
Violins in the Smithsonian
Vasquez Collection (Castello di Duino, Italy)–Violin Family
Mittenwald Museum of Violin Building (Germany)
Museo del Violino, Cremona, Italy
National Instrument Museum (Vermillion, SDak)–Bowed Strings
Violins in the Smithsonian
Vasquez Collection (Castello di Duino, Italy)–Violin Family
Mittenwald Museum of Violin Building (Germany)
Articles
Research article on the acoustics of instruments by A. Stradivari (University of New South Wales)
Violin Makers: Nicolò Amati and Antonio Stradivari (Metropolitan Museum of Art)