1 Table of Contents: “...section 1. Introduction and use of the guide -- section 2. Past, present, and future of emergency...”

2 “... to Earth via space missions over the past four decades. Analyses of these previously returned samples have...”

3 “..., techniques, and growing knowledge base that considers past, present, and future pathways. Specific...”

4 “...Each emergency comes with its own set of challenges, however, many emergencies of the past can...”

5 Table of Contents: “... -- Chapter 1 -- Introduction -- Chapter 2 -- Past Natech Events -- 2.1 -- Characteristics of Natech events...”