Mean monthly sea-level pressure maps for North and Central America / by M.K. Thomas. : En58-27/4-77E-PDF

"The attached maps depict the mean sea-level pressure patterns over North and Central America expressed in kilopascals for each month of the year. These maps were prepared in 1966-67 as part of the World Meteorological Organization's Climatic Atlas Project. However, since the project has not moved as quickly as anticipated, this set of maps is being issued on an informal basis as reference material for Weather Offices. In the decade since their preparation there has not been any more up-to-date publication of pressure maps so it is believed that these maps will contain valuable and useful reference information"--Page [1].

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