General link on manufacture:
http://www.pcgs.com/coinguidetext/display_...l?chapter=mintsThe PCGS Lingo Guide:
http://www.pcgs.com/lingo.chtmlwhere you can look up things like 'galvanao' 'hub' 'die' etc
I can also recommend a book:
http://www.amazon.com/exec/obidos/tg/detai...142354?v=glanceWhich has a great section on how coins are made and tells how many, many errors and varieties are created dealing with various types of dies (working, etc), hubs and such. For the price, it is a great work on the minting process, errors and varieties. I don't think I could recommend this book more strongly if you want to know some details about varieties, errors and the minting process.
Although it has prices, it is not really a price guide but rather a great general work on the minting process and the errors and varieties that can result.
Look inside the book and you can get a glimpse of the information within:
http://www.amazon.com/gp/reader/0609808559...354#reader-link