Airship and ballon gas manual book I[-II]
By: Prepared by the Air service, October, 1919 [-January, 1920]
Publisher: Govt. print. off.
Published: 1920
Place of publication: Washington
Language: eng
Subjects: Balloons; Hydrogen; Helium
Notes: On verso of t.-p.: War department. Document no. 985. Office of the adjutant general.

Book II has added title: Gas plant operation.