Online auxiliary sciences
Palaeography: Capelli online: http://inkunabeln.ub.uni-koeln.de/vdibProduction/handapparat/nachs_w/cappelli/cappelli.html
Chronology: Grotefend online: http://www.manuscripta-mediaevalia.de/gaeste/grotefend/grotefend.htm
Place Names: Orbis Latinus online: http://www.columbia.edu/acis/ets/Graesse/contents.html