This anthology was groundbreaking when it first appeared in the early 1970s as exhibit A in the case to take contemporary, English-language haiku seriously. Though other excellent anthologies have emerged since then -- some with arguably better claims to breadth or inclusiveness -- each edition of
The Haiku Anthology has managed to successfully reassert its status as the indispensable standard-bearer. It remains the one to start with, and the one to get if you can only get one.
Here is a purchase link.
(If this is not allowed because it is an anthology, I will take it back.)
David R.