URL details: zoe-and-will.com/index-15.html

URL title: Hydrogen and Helium in Airship Operations | Airships.net
URL paragraphs: '+testing+' The two primary lifting gases used by airships have been hydrogen and helium. Hydrogen is the earth’s lightest element, and it can be obtained easily and inexpensively, but its flammability makes it unacceptable for manned airship operation
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