In this paper some properties of epi-representations and Schmidt-congruence relations of orthomodular partial algebras are investigated and an infinite list of
OMA-epi-subdirectly irreducible orthomodular partial algebras will be constructed.
Keywords orthomodular partial algebra - epi-subdirect representation
Special issue of Studia Logica: 
Algebraic Theory of Quasivarieties
Presented by
M. E. Adams, K. V. Adaricheva, W. Dziobiak, and A. V. Kravchenko