Book excerpt: 0 An extended introduction (starting p. 1) -- 1 Some preliminaries concerning interpretations, groups and [actual symbol not reproducible]-categoricity (starting p. 29) -- 2 A new reconstruction theorem for Boolean algebras (starting p. 43) -- 3 The completion and the Boolean algebra of a U-tree (starting p. 57) -- 4 The statement of the canonization and reconstruction theorems (starting p. 63) -- 5 The canonization of trees (starting p. 73) -- 6 The reconstruction of the Boolean algebra of a U-tree (starting p. 87) -- 7 The reconstruction of PT(Exp(M)) (starting p. 135) -- 8 Final reconstruction results (starting p. 153) -- 9 Observations, examples and discussion (starting p. 155) -- 10 Augmented trees (starting p. 169) -- 11 The reconstruction of [actual symbol not reproducible]-categorical trees (starting p. 205) -- 12 Nonisomorphic 1-homogeneous chains which have isomorphic automorphism groups (starting p. 243) -- Bibliography (starting p. 251) -- A list of notations and definitions (starting p. 253)