Which activities add value and which don't?

Which activities add value and which don't?

Scott M. Shafer, Frank Collins
How much do you like this book?
What’s the quality of the file?
Download the book for quality assessment
What’s the quality of the downloaded files?
Volume:
3
Year:
1991
Language:
english
Pages:
8
DOI:
10.1002/jcaf.3970030208
File:
PDF, 602 KB
english, 1991
Conversion to is in progress
Conversion to is failed