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That is the GM Shop Manual for your 1980 Corvette. It may be a reprint, which is fine, but you can also locate originals on ebay.
It is a good book, used by the dealers for repairs. At times it may be hard to understand, but can always do a search or ask questions here.
You should also invest in the AIM book for your Vette. Between those two books, you will have a great deal of info at your fingertips.....Tom