Good selection. Not all of them are seminal in the philosophy of language, but of course that's arguable. The selection is nevertheless good: Tarski's "The Semntic Conception of Truth"; C.I. Lewis "The Modes of Meaning"; N. Goodman's "On Likeness of Meaning" and "The Problem of Counterfactual Conditionals"; Quine's "Notes on Existence and Necessity" and "On What There Is"; Russell's "Descriptions"; B. Mates' "Synonymity"; P. Marhenke's "The Criterion of Signficance"; Carl Hempel's "Problems and Changes in the Empiricist Criterion of Meaning"; Carnap's "Empiricism, Semantics, and Ontology"; A. Naess' "Toward a Theory of Interpretation and Preciseness"; M.G. White's "The Analytic and the Synthetic: An Untenable Dualism"

although the articles of this book are definitely of excellent quality, there is little directly on the Tractatus. The only one such is Hylton's short but quality article dealing with how the function-operation distinction in the Tractatus is addressing Russell's rather than Frege's issues... the others deal mostly with the later Wittgenstein..