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  1.  16
    First-Order Modal Logic.Melvin Chris Fitting & Richard L. Mendelsohn - 1998 - Dordrecht, Netherland: Kluwer Academic Publishers.
    This is a thorough treatment of first-order modal logic. The book covers such issues as quantification, equality (including a treatment of Frege's morning star/evening star puzzle), the notion of existence, non-rigid constants and function symbols, predicate abstraction, the distinction between nonexistence and nondesignation, and definite descriptions, borrowing from both Fregean and Russellian paradigms.
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  2.  24
    Intuitionistic Logic, Model Theory and Forcing.Melvin Chris Fitting - 1969 - Amsterdam: North-Holland Pub. Co..