All of the formats of the Mother Stories’ series books (http://henryaltemus.com/series/series132.htm) have the same text but there are some other fairly significant differences. The reverse of the dust jackets went through an evolution during the years of publication. The earliest dust jackets listed only the first 6 books. Later the jackets listed 10 books at 50 cents, then at $1.00 and finally without any price.

Another recently noted difference is that the colored frontispieces changed as the years went on. There is no way to chronologically date these pictures except to say they are different as time went by.

Here are three examples from Mother Stories.