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Is this book a gray literature?

Is this book a gray literature?

T.Hengl - Sun, 12/13/2009 - 19:24
Yes, only respected commercial publishers can guarantee quality
13% (26 votes)
Yes, I think many parts of this book need to be reviewed/revised
5% (10 votes)
Who cares - it's accurate, useful and well writen
83% (170 votes)
Total votes: 206