Letters Two balloon-voyages By H. A. Hazen See allHide authors and affiliations Science 17 Jun 1887:Vol. ns-9, Issue 228, pp. 591-592DOI: 10.1126/science.ns-9.228.591 H. A. Hazen Find this author on Google Scholar Find this author on PubMed Search for this author on this site Article Info & Metrics eLetters PDF This is a PDF-only article. The first page of the PDF of this article appears above.