Also a book, listing many of the common phrases in everyday use, like 'keep your eyes peeled', 'no skin off my nose', and 'an apple a day keeps the doctor away'. It tells about their origins, why they came about and when, plus some lesser-known versions.
Heavens to Betsy, by the way, is mostly a polite way of saying 'Holy shit!'

It was written by Charles Earle Funk.