Prototypes
subset 1A:
c. 1v: http://dcl.slis.indiana.edu/petrarchive/teibp/content/c001v.xml
subset 1B:
c. 22r: http://dcl.slis.indiana.edu/petrarchive/teibp/content/c022r.xml
subset 1C:
c 22v-23r: http://dcl.slis.indiana.edu/petrarchive/teibp/content/c022v-c023r.xml
subset 2:
c. 14v: ???
subset 3:
...