Contents:
Introduction; Orthomodular Measures; Gleason's Theorem; Jordan-Hahn Decomposition; Orthofacial Sets of States; Equational Classes Related to States; Decomposition of Complete Orthomodular Lattices; Characterization of Dimension Lattices; Birkhoff-Von Neumann Theorem; Coordinatizations; Kakutani-Mackey Theorem; Keller's Non-Classical Hilbert Spaces;