1. From the editors

   • M. E. Adams
   • W. Dziobiak

   Letter Pages: 1 - 1

2. The dual space of a finite simple Ockham algebra

   • T. S. Blyth
   • J. C. Varlet

   OriginalPaper Pages: 3 - 21

3. Free Q-distributive lattices

   • Roberto Cignoli

   OriginalPaper Pages: 23 - 29

4. The countable homogeneous universal model of B ₂

   • David M. Clark
   • Jürg Schmid

   OriginalPaper Pages: 31 - 66

5. Optimal natural dualities for varieties of Heyting algebras

   • B. A. Davey
   • H. A. Priestley

   OriginalPaper Pages: 67 - 96

6. Representation of finite demi-p-lattices by means of posets

   • Hernando Gaitan

   OriginalPaper Pages: 97 - 110

7. Birkhoff-like sheaf representation for varieties of lattice expansions

   • Hector Gramaglia
   • Diego Vaggione

   OriginalPaper Pages: 111 - 131

8. Priestley duality for some subalgebra lattices

   • Georges Hansoul

   OriginalPaper Pages: 133 - 149

9. Semi-DeMorgan algebras

   • David Hobby

   OriginalPaper Pages: 151 - 183

10. A simplified duality for implicative lattices and l-groups

    • Nestor G. Martinez

    OriginalPaper Pages: 185 - 204

11. Distributive lattices with an operator

    • Alejandro Petrovich

    OriginalPaper Pages: 205 - 224

12. Semilattice-based dualities

    • A. B. Romanowska
    • J. D. H. Smith

    OriginalPaper Pages: 225 - 261

13. Duality for algebras of relevant logics

    • Alasdair Urquhart

    OriginalPaper Pages: 263 - 276

14. List of published papers

    Legacy Pages: 277 - 290

15. Announcement

    Announcement Pages: 291 - 291