A note on the structure of the power set. - George F. Schumm (Notre Dame J. Formal Log., 1968)

On some open questions of B. Sobociński. - George F. Schumm (Notre Dame J. Formal Log., 1969)

On a modal system of D. C. Makinson and B. Sobociński. - George F. Schumm (Notre Dame J. Formal Log., 1969)

Solutions to four modal problems of Sobociński. - George F. Schumm (Notre Dame J. Formal Log., 1971)

S3.02=S3.03. - George F. Schumm (Notre Dame J. Formal Log., 1974)

K and Z. - George F. Schumm (Notre Dame J. Formal Log., 1974)

Wajsberg normal forms for S5. - George F. Schumm (J. Philos. Log., 1975)

Disjunctive extensions of S4 and a conjecture of Goldblatt's. - George F. Schumm (Math. Log. Q., 1975)

A Henkin-style completeness proof for the pure implicational calculus. - George F. Schumm (Notre Dame J. Formal Log., 1975)

Remark on a logic of preference. - George F. Schumm (Notre Dame J. Formal Log., 1975)

An Incomplete Nonnormal Extension of S3. - George F. Schumm (J. Symb. Log., 1978)

Putting K in its place. - George F. Schumm (Notre Dame J. Formal Log., 1978)

Negation-Free Modal Logics. - George F. Schumm; Roy Edelstein (Math. Log. Q., 1979)

Bounded Properties in Modal Logic. - George F. Schumm (Math. Log. Q., 1981)

Some failures of interpolation in modal logic. - George F. Schumm (Notre Dame J. Formal Log., 1986)

The number of nonnormal extensions of S4. - George F. Schumm (Notre Dame J. Formal Log., 1988)

Some Compactness Results for Modal Logic. - George F. Schumm (Notre Dame J. Formal Log., 1989)

The number of {□, →}-logics. - George F. Schumm (Math. Log. Q., 1990)

Expressive Completeness and Decidability. - George F. Schumm; Stewart Shapiro (Notre Dame J. Formal Log., 1990)