Instructions for aerological observers
By: By W. R. Gregg, in charge, Aerological division, assisted by Messrs. V. E. Jakl, W. S. Cloud, L. T. Samuels, and R. C. Lane
Contributors: Cloud, W. S.; Gregg, Willis Ray, 1880-1938; Jakl, Vincent Edward, 1880-; Lane, R. C. (Russell Charles), 1893-; Samuels, Leroy Thomas, 1893-
Publisher: Govt. print. off.
Published: 1921
Place of publication: Washington
Language: eng
Number of pages: 115
Subjects: Meteorology; Observers' manuals; Aeronautics in meteorology
Notes: At head of title: W.B. 740. U.S. Dept. of agriculture. Weather bureau.

1928 edition has title: Instructions for making pilot balloon observations (Circular 0); 1930 edition, Instructions for making aerological observations (Circular P) 1W371.