This also goes for using poetry in artist's books, etc. The poet (or their
estate) may charge by the line. A friend and I did this with W.B. Yeats
(Bertha Georgie Yeats), which allowed us to print several of his
lesser-known poems in a book we titled "Unnoticed Like a Bird". They were
kind of surprised we wanted the poems we did, and when they understood we
were only making 30 something books, charged us 35 cents a line, which we
thought was a great deal. It's worth the effort.