EPA R12 license on-line:

http://www.epatest.com/609/

http://www.acca.org/epa/

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You can buy R12 on-line with a license:

http://motors.shop.ebay.com/__?_from=R40&_trksid=p3841.m39.l1313&_nkw=r12%20refrigerant&_sacat=&rvr_id=&MT_ID=335&crlp=105369851 1_9887&tt_encode=raw&geo_id=491&keyword=r12+refrigerant&adgroup_id=521577291

http://www.google.com/search?hl=en&rls=com.microsoft%3Aen-us&q=r12+refrigerant&aq=2e&oq=r12&aqi=g-e4g6

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FREE, download, Generic training material for beginners:

Automotive Air Conditioning Systems
http://www.familycar.com/ac1.htm

Aircondition.Com
http://aircondition.com/knowledge_base/Home.html

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