http://outreach.ocs.ou.edu/teachers/lessons/airmasses.html
http://outreach.ocs.ou.edu/teachers/lessons/airmassesfronts.html
http://www.ecn.ac.uk/Education/air_masses.htm
http://www2.sunysuffolk.edu/mandias/fronts_help.html
http://www.doc.mmu.ac.uk/aric/eae/Climate/Older/Air_Masses.html
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