A section and a plan of the burial ground under St. Peter's, with tombs lettered A to Z and Bernini's baldachin at the top.
Source: Kai Gaertner
A cross-section places the necropolis below the basilica, with Bernini's baldachin above. The plan beside it lettered the tombs from A to Z. The sheet is dated 1983 and credited to Kai Gaertner.