Volume 1-4 includes Bott's papers up to 1991; volume 5: "brings together all of Raoul Bott's publications since 1991, some unpublished articles, as well as some earlier published articles not included in prior volumes of his Collected Papers" (preface).
Volume 5 edited by Loring W. Tu.
Includes bibliographical references.
v. 1. Topology and Lie groups -- v. 2. Differential operators -- v. 3. Foliations -- v. 4. Mathematics related to physics -- v. 5. Raoul Bott, Collected Papers.