John Weeks

WeeksPopulation

書籍

/1月 10, 2012
/John Weeks

This app accompanies all editions of the book by John R. Weeks, “Population: An Introduction to Concepts and Issues,” published by Cengage Learning, a...

Introduction To Math

教育

/9月 2, 2011
/John Weeks

This is an app which teaches basic math (addition and subtraction as well as multiplication and division) to children from ages 2 to 5. But the hardes...