Euclid + Lincoln = Kent; A + B = C; Universal Formula : Grammar of nature or key to the master mind .

Mode of access: Internet.

The key to the bottomless pit, or, A daguerrean likeness of the beast with seven heads and ten horns, with his foot prints, and the number of his name : found between the lids of the Old Bible ...

Mode of access: Internet.

A key to the exercises in the first six books of Casey's Elements of Euclid.

Available on demand as hard copy or computer file from Cornell University Library.