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Harrah, David, Formal Message Theory and Non-Formal Discourse (1976)
Harrington, Leo, Long Projective Wellorderings
Harrington, Leo, The Constructible Reals can be (Almost) Anything (1974)
Harrington, Leo, The Superjump and the First Recursively Mahlo Ordinal (1974)
Harrington, Leo, Analytic Determinacy and $0^#$ (1978)
Harrington, Leo, $\Pi_2^1$ Sets and $\Pi_2^1$ Singletons (1979)
Harrington, Leo ; Jech, Thomas, On $\Sigma_1$ Well Orderings of the Universe
Harrington, Leo ; Kechris, Alexander S., $\Pi_2^1$ Singletons and $\O^#$
Harrington, Leo ; Kechris, Alexander S., A Basis Result for $\Sigma_3^0$ Sets of Reals with an Application to Minimal Covers (1975)
Harrington, Leo ; Shore, Richard A., Definable Degrees and Automorphisms of $D$ (1980)