**Ars Combinatoria **

**Volume LIV, December, 1999 **

**Robert C. Brigham, Julie R. Carrington and Richard P. Vitray **"Bipartite Graphs and Absolute Difference Tolerances"

**Wun-Seng Chou and Peter Jau-Shyong Shiue **"On the Group of Line Crossings on the 2-D Torus "

**H.L. Fu, C.A. Rodger and D.G. Sarvate **"The existence of group divisible designs with first and second associates, having block size 3 "

**Hirobumi Mizuno and Iwao Sato **"Isomorphisms of Cyclic Abelian Covers of Symmetric Digraphs"

**David Vickrey **"k-equitable labelings of complete bipartite and multipartite graphs"

**D.G. Hoffman and K.S. Kirkpatrick **"Another Doyen-Wilson Theorem"

**Christos Koukouvinos and Jennifer Seberry **"New orthogonal designs and sequences with two and three variables in order 28"

**Dragan Acketa, Vojislav Mudrinski and Snezana Matic-Kekic **"A large collection of designs from a wreath product on 21 points"

**I. Cahit and R. Yilmaz **"E3-Cordial Graphs"

**Wayne Goddard, Ortrud Oellermann, Peter Slater and Henda Swart **"Bounds on the Total Redundance and Efficiency of a Graph"

**Yi-Liang Chen and Wei-Hou Cheng **"A Note on Joint Distributions of Some Random Vectors Defined on Permutations"

**Leonid M. Koganov, Valery A. Liskovets and Timothy R.S. Walsh **"Total Vertex Enumeration in Rooted Planar Maps"

**Jason E. Fulman, Michael D. Galloy, Gary J. Sherman and Jeffrey M. Vanderkam **"Counting Nilpotent Pairs in Finite Groups"

**Neil P. Carnes, Anne Dye and James F. Reed **"Bicyclic Antiautomorphisms of Mendelsohn Triple Systems"

**Tilla Schade **"The linear 3-cover of the Hermitean forms graph on 81 vertices"

**L.H. Clark and J.W. Moon **"On the General Randic Index for Certain Families of Trees"

**Jeno Lehel and Inessa Levi **"Loops With Partitions and Matchings"

**David Bedford and Roger M. Whitaker **"New and Old Values for Maximal MOLS(n)"

**Sheng-Chyang Liaw, David Kuo and Gerard J. Chang **"Integral Sum Numbers of Graphs"

**Robert B. Gardner, Coleen Huff and Janie Kennedy **"Decompositions and Packings of Digraphs with Orientations of a 4-Cycle"

**M.A. Seoud, A.E.I. Abd el Maqsoud and J. Sheehan **"Gracefulness of the union of cycles and paths"

**Bhalchandra D. Thatte **"G-reconstruction of graphs"

**Jeremy Dover **"Spreads and Resolutions of Ree Unitals"

**G. Gutin **"Connected (g,f)-factors and supereulerian digraphs"

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