Category theory began to be applied to general topology in the early seventies. The first two papers below were precursors of categorical topology. The others contribute directly.
1. "An Isomorphism Theorem," Proc. Indian Acad. Sci. 67 (1968) 219-221.
2. "Natural Covers," Compositio Math. 21 (1969), 253-261.
3. "On Epi-reflective Hulls," General Topology & its Applications 1 (1971), 29-31.
4. Topics in Categorical Topology, another cited but unpublished set of class notes from Carnegie Mellon University.
5. "On Subcategories of TOP," Trans. Amer. Math. Soc., 225 (1977) 267-278. (with D. J. Lutzer and B.S. Thomas).
6. "On the metrizability of k-spaces" (with B.V.S. Thomas), Pacific J. of Mathematics. 72 (1977),399-402.
7. "A survey of k-spaces" (with B.V.S. Thomas), Topology Proceedings 2(1977) 111- 124.
8. "Topologies determined by paths" (with B.V.S. Thomas), Topology Proceedings, 4(1979) 371-384.
9. "On a class of projective Tychonoff spaces" (with A. K. Gubbi). Unpublished manuscirpt.