It's fascinating that Paul Dirac's 1926 PhD thesis is simply titled "Quantum Mechanics," and consists of handwritten text and formulas with scribbles and crossed-out text.
As the first-ever PhD thesis on the subject, it reflects the era's norms before widespread use of typewriters or printing for such documents. It includes numerous "sloppy" elements typical of a working draft: sprawling, sometimes sloping equations that fill pages irregularly, frequent strikeouts (crossings-out) where Dirac revised calculations or derivations, and marginal notes jotted in his unique notation system.
These features offer a glimpse into his iterative thought process, such as working through algebraic axioms, quantum numbers, and particle motion in central fields, often with equations rambling across the page before corrections. The full manuscript spans about 72 pages.