Divine Angel said:

Dr Seuss’ book, The Little Book of Boners (“boners” being a term for blunders) will come into public domain next year. There were several books in the Boner series:

• Boners (102 p.) (copyright February 7, 1931) (illustrated by Dr. Seuss)
• More Boners (copyright April 13, 1931) (illustrated by Dr. Seuss)
• Still More Boners (copyright August 4, 1931) (illustrated by Virginia Huget)
• Prize Boners for 1932 (copyright March 4, 1932) (illustrated by Virginia Huget)

Many compilations of Boners content were subsequently released, including The Omnibus Boners (1931), The 2nd Boners Omnibus (1938) (pictures by Galdone), and Bigger & Better Boners (1952)

Still, seeing a Dr Seuss book called Little Book of Boners took me aback.

Giggle.