#1-3:
http://itg1.meteor.wisc.edu/wxwise/AckermanKnox/chap9/airmass_rev.html
#4-6:
https://usatoday30.usatoday.com/weather/tg/wamsorce/wamsorce.htm
The links for #7-11 aren't working. You can skip those. Sorry!
#12-15:
http://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/af/frnts/cfrnt/def.rxml
#16-19:
http://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/af/frnts/sfdef.rxml
#20-23:
http://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/af/frnts/wfrnt/def.rxml
#24-25:
http://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/af/frnts/ofdef.rxml