'Individuals' and 'Word and Object'

Strawson and Quine’s books in the analytic philosophy tradition did not, as I recall, venture into logicism. Each were about propositions and the subject-object distinction, intentional and extensional thought, about the relationship of propositions to perceptions. They struck me as very intense psychological-analytical applications of Kant’s categories of thought; not as just categories within mind, and not the same categories, instead as very subtle descriptions of what propositional thought is and how it relates to the ’empirical’.

It's just reason and work. Subtle yet plain. . I.M.O. the works I mentioned are simply rationalism continuing the investigation of thought started by Descartes. It was a natural development and a period in the history of philosophy they moved through. Quine held the Edgar Pierce Chair of Philosophy at Harvard a quarter century. What Strawson and Quine developed was a major contribution to western thought.