Testing R Code (Chapman & Hall/CRC - Hardcover, by Cotton Richard - Acceptable

2017 HC Testing R Code (Chapman & Hall/CRC The R Series) by Cotton, Richard

Learning R: A Step-by-Step Function - Paperback, by Cotton Richard - Very Good

Learning R: A Step-by-Step Function Guide - Richard Cotton - Paperback

Machine Tool Practices by Richard R. Kibbe, John E. Neely, Roland O. Meyer

Learning R: A Step-by-Step Function Guide to Data Analysis, Cotton, Richard, Boo

Learning R : A Step-By-Step Function Guide to Data Analysis by Richard Cotton...