Words are important

This is one of the most important book(s) for children! Different versions used different grading methods to indicate for different school's gradings. They were used to teach students from Grade 5 to Grade 13 (For Ontario). But I found them important to be used all the way to university level. Some Grading method used, "Red, Brown, Yellow, . . ." but older version had nothing on them. Different countries, had different printing too. A Canadian version was different from those being used as teaching materials in the US or UK. These "Words are Important" were rewritten by another author. But personally, I prefer the old version by H.C. Hardwick. How I found this useful? I learned them in the 1980's. Before I got married, I began looking for all of them for my children. I spent a total of more than 15 years in different countries and different bookstores to find all of them.