Consider some class $ C $ of groups that is closed under subgroups, quotients,and unrestricted wreath products, and let $ G $ be the generalized free productof groups $ A $ and $ B $ with an amalgamated subgroup $ H $ ,which is a normal and proper subgroup of the free factors.Suppose thatthe subgroup of the automorphism group of $ H $ consisting of the restrictions to $ H $ of all inner automorphisms of $ G $ is finite,or abelian,or generated by the restrictions of inner automorphisms of one of the free factors.In this article we describe the $ C $ -separable finitely generated abelian subgroupsof $ G $ on assuming thatthe latter is a residually $ C $ -group.A criterion for the $ C $ -residuality of $ G $ is available.
