A pamphlet or chapbook is a small collection of poetry, usually 15 to 30 poems, centering around one theme.
They are sometimes handmade or saddle-stitched, a format best suited for small print runs.
Compared to a full-length poetry collection, a pamphlet is fairly inexpensive to produce.
In the United States, a poetry pamphlet is called a chapbook.
[1] Since 2003, the Poetry Society of America offers an annual chapbook fellowship.