I’ve had occasion recently to do a bit of work on a couple of Cicero’s letters to Atticus. Both the old text of Tyrrell and Purser and the more recent text of Shackleton Bailey are wonderful resources, but there are a couple of places where I wanted to check the manuscripts. About half of the most important manuscripts are available online. A set of links seems like it would be useful. Among the primary witnesses, there are:

E = Milan, Biblioteca Ambrosiana E 14 inf. (14th century; thanks to Jenny Lynn for the link)
G = Paris, BnF Latin 16248 (14th-15th century)
H = Piacenza, Biblioteca Civica Passerini-Landi, Landianus 8 (14th-15th century) not online
M = Florence, BML Plut. 49.18 (1392-1393)
N = Florence, BML Conv.Soppr. 49 (14th-15th century) not online
O = Turin, Lat. 495 (15th century) not online
R = Paris, BnF Latin 8538 (1419)
P = Paris, BnF Latin 8536 (15th century)
V = Vatican, Pal. Lat. 1510 (15th century)

W= a set of dispersed folia from an 11th century codex as follows:

• Würzburg, Universitätsbibliothek M.p.misc.f.21, not online
• Würzburg, Diözesanarchiv, Fragm. Würzburg, St. Ulrich, not online
• Munich, Bayerische Staatsbibliothek Clm 29220(20, not online

Among the witnesses usually considered less important for establishing the critical text:

b = Berlin, Staatsbibliothek 168 (15th century) not online
d = Florence, BML Edili 217 (15th century) not online
m = Berlin Staatsbibliothk Ham. 166 (1408, copied by Poggio)
s = Vatican, Urb. Lat. 322 (15th century)

If I’ve missed the proper links for any of the pieces that I’ve marked as “not online,” I would be grateful for the right links.