President Johnson could probably match his kiddy correspondence with that of Art Linkletter and come up the winner. These were chosen from the thousands he eceives from children each week. Included are pleas -- ""All I need to be richest n my class is 18Â¢. Please""; an apology -- ""It's very hard to talk to the President of the United States. I mean what is there to say? That is why I said nothing.""; advice -- ""If you had a Mr. & Mrs. youth fitness program they would have physical ""ames""; a reprimand after learning that the President swims nude in the White House ool --""If you want to know my opinion I don't approve of the matter I think you etter start wearing a bathing suit."" The letters are reproduced in the original ritten or printed form and the illustrations are by the creator of the Peanuts omic strip, as only he can do small, determined and/or exasperated children. This should make it from the impulse buyers rack in bookstores as the sort of book it's un to find on cocktail tables.