What was the title of Stephen Hawking's 1966 Adams Prize essay?

What was the title of Stephen Hawking's 1966 Adams Prize essay? The answer is Singularities and the Geometry of Space-Time.

Hawking wrote the essay during the period when he was completing his doctoral work in applied mathematics and theoretical physics at Cambridge. The essay shared top honours in the 1966 Adams Prize with work by Roger Penrose, reflecting the importance of their related research on spacetime singularities.

The title points to a central problem in general relativity: how the geometry of spacetime behaves when matter collapses so intensely that the theory predicts a singularity. Hawking applied ideas developed from Penrose's work on black holes to cosmology and the possible beginning of the universe.

Hawking's PhD was approved in 1966, and he received his doctorate in March of that year. The essay should not be confused with The Large Scale Structure of Space-Time, his major 1973 book, or later popular works such as A Brief History of Time.