There has been data ("Mastering Your Focus: How To Use Simple and Effective Strategies to Improve Concentration, Learn Faster, Ignore Distractions, Master Anything With ... Time Management Techniques) (Volume 1)") available for this ISBN from the data sources that books-by-isbn.com uses, but not on the latest request on Wed Feb 5 14:24:28 2020, so the data displayed here has been removed .