Instructions for making pilot balloon observations.
Series: Circular / U. S. Dept. of Agriculture, Weather Bureau, Aerological Division -- O; Circular (United States. Weather Bureau) -- O.
Publisher: U.S. Govt. Print. Off.
Published: 1928
Place of publication: Washington
Language: eng
Number of pages: 66
Subjects: Balloons, Pilot
Notes: At head of title: W.B. no. 961, U. S. Dept. of Agriculture. Weather Bureau.