At the bottom left of the Aleppo site web
(http://www.aleppocodex.org/aleppocodex.html) , there are scroll boxes for
choosing the book, the chapter and the verse. You might have to scroll down
to see this, if your screen is smaller than mine (actually, I have to scroll
down, too). To the right of this there is a neat magnifier with which you
can see the text very close up. I really wish there were a site like this
for B 19a.