 By the early 20th century this had been modified in some collections , such as L. E. Walter 's , Mother Goose 's Nursery Rhymes ( London , 1919 ) to : 
 By the early 20th century this <a href='been_done' title='1'><mark>had</mark></a> been modified in some collections , such as L. E. Walter <a href='null_genetive' title='2'><mark>'s</mark></a>, Mother Goose <a href='null_genetive' title='3'><mark>'s</mark></a>Nursery Rhymes ( London , 1919 ) to : 
By the early 20th century this done been modified in some collections , such as L. E. Walter  , Mother Goose  Nursery Rhymes ( London , 1919 ) to :