United States. Weather Bureau & United States. Army Air Forces. (1946). Normal weather maps, Northern Hemisphere sea level pressure.
Chicago Style (17th ed.) CitationUnited States. Weather Bureau and United States. Army Air Forces. Normal Weather Maps, Northern Hemisphere Sea Level Pressure. [Washington], 1946.
MLA (8th ed.) CitationUnited States. Weather Bureau and United States. Army Air Forces. Normal Weather Maps, Northern Hemisphere Sea Level Pressure. 1946.
Warning: These citations may not always be 100% accurate.