Acceptable. A readable copy. All pages are intact, and the cover is intact (However the dust cover may be missing). Pages can include considerable notes--in pen or highlighter--but the notes cannot obscure the text. Book may be a price cutter or have a remainder mark.
Acceptable. A book with obvious wear. May have some damage to the cover or binding but integrity is still intact. There might be writing in the margins, possibly underlining and highlighting of text, but no missing pages or anything that would compromise the legibility or understanding of the text.
This is the same Class room book that they use for most all my HVAC classes. The only difference is they use the sixth edition know, but the book has all the same information. A great reference book for some older topics not taught in today's classes.
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