APA (7th ed.) Citation

United States. Weather Bureau & Gregg, W. R. (1918). I. Free-air data at Drexel, Nebr., and Ellendale, N.Dak., aerological stations, Jan., Feb., and Mar. 1918, inclusive; II. Free-air temperatures during cold winter of 1917-18; III. Ellendale Aerological Station. U.S. GPO.

Chicago Style (17th ed.) Citation

United States. Weather Bureau and Willis Ray Gregg. I. Free-air Data at Drexel, Nebr., and Ellendale, N.Dak., Aerological Stations, Jan., Feb., and Mar. 1918, Inclusive; II. Free-air Temperatures During Cold Winter of 1917-18; III. Ellendale Aerological Station. Washington: U.S. GPO, 1918.

MLA (9th ed.) Citation

United States. Weather Bureau and Willis Ray Gregg. I. Free-air Data at Drexel, Nebr., and Ellendale, N.Dak., Aerological Stations, Jan., Feb., and Mar. 1918, Inclusive; II. Free-air Temperatures During Cold Winter of 1917-18; III. Ellendale Aerological Station. U.S. GPO, 1918.