Volume 54, Number 1, May 1990

• 
  Wojciech Guzicki: Ulam's searching game with two lies. 1-19
• 
  Esther R. Lamken, Scott A. Vanstone: The existence of skew Howell designs of side 2n and order 2n + 2. 20-40
• 
  Dennis Stanton: Unimodality and Young's lattice. 41-53
• 
  Lynne M. Butler: The q-log-concavity of q-binomial coefficients. 54-63
• 
  Pierre Leroux: Reduced matrices and q-log-concavity properties of q-Stirling numbers. 64-84
• 
  Peter Frankl: Intersection theorems and mod p rank of inclusion matrices. 85-94
• 
  Peter Frankl, Ronald L. Graham, Vojtech Rödl: Iterated combinatorial density theorems. 95-111
• 
  Robert L. McFarland: Sub-difference sets of Hadamard difference sets. 112-122
• 
  István Beck: An inequality for partially ordered sets. 123-128
• 
  A. Robert Calderbank: Covering radius and the chromatic number of Kneser graphs. 129-131
• 
  Richard A. Brualdi, Bryan L. Shader: Matrix factorizations of determinants and permanents. 132-134
• 
  Bruce N. Cooperstein: A sporadic ovoid in Omega⁺(8, 5) and some non-desarguesian translation planes of order 25. 135-140
• 
  Shalosh B. Ekhad: A very short proof of Dixon's theorem. 141-142
• 
  Galina Kolesova, Clement W. H. Lam, Larry H. Thiel: On the number of 8×8 latin squares. 143-148

Volume 54, Number 2, July 1990

• 
  Ljubo Marangunic: Biplanes (56, 11, 2) with involutory collineation fixing 6 points. 149-163
• 
  Eiichi Bannai, Shen Hao, Sung-Yell Song: Character tables of the association schemes of finite orthogonal groups acting on the nonisotropic points. 164-200
• 
  Arnold Neumaier: Krein conditions and near polygons. 201-209
• 
  Walter Wenzel: Algebraic relations between matroids connected by weak homomorphisms. 210-224
• 
  Robert A. Proctor: Solution of a sperner conjecture of stanley with a construction of gelfand. 225-234
• 
  Robert A. Proctor: Product evaluations of lefschetz determinants for grassmannians and of determinants of multinomial coefficients. 235-247
• 
  Zoltán Füredi: Covering pairs by q² + q + 1 sets. 248-271
• 
  Ömer Egecioglu, Jeffrey B. Remmel: The monomial symmetric functions and the Frobenius map. 272-295
• 
  Kevin J. Compton, Carlos H. Montenegro: The largest set partitioned by a subfamily of a cover. 296-303
• 
  Maohua Le: On Golomb's conjecture. 304-308
• 
  Shalosh B. Ekhad, Sol Tre: A purely verification proof of the first Rogers-Ramanujan identity. 309-311
• 
  Albrecht Beutelspacher: How to communicate efficiently. 312-316
• 
  Richard Garfield, Donald E. Knuth, Herbert S. Wilf: A bijection for ordered factorizations. 317-318

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