Wouldn't it depend on the date of death of the book designer? (Although this may barely qualify as a design.) —Celithemis 01:11, 3 March 2007 (UTC)[reply]
If the designer is unknown, it is 70 years, surely? -- ALoan(Talk) 11:33, 3 March 2007 (UTC)[reply]
The designer's unknown to me; I don't know about unknown unknown. —Celithemis 01:33, 4 March 2007 (UTC)[reply]