"poem collection" is a perfectly grammatical and usable phrase in written English.
You can use it to refer to a book or a compilation of poems, e.g., "My favorite poem collection is The Poems of Emily Dickinson."
Before intermission were eight songs from "Des Knaben Wunderhorn," Mahler's settings of the celebrated early 19th-century folk poem collection.
He went on to play a role in Milne's poem collection When We Were Very Young, published in 1924, before starring in 1926's Winnie-the-Pooh, which was an immediate hit.
Not staged in full in the UK since Victor Spinetti turned it into a play at the National Theatre in 1968, John Lennon's 1964 short story and poem collection In His Own Write is an interesting curio from the late Beatle's early career.
Lloyd Webber began writing music at a very early age, finishing a suite of six pieces at the tender age of nine and writing music for the Old Possum's Book of Practical Cats -- the T.S. Eliot poem collection on which "Cats" is based -- at a mere 15 years old.
Louise Glück's prose-poem collection, Faithful and Virtuous Night, won for poetry.
The much-loved broadcaster, critic, memoirist, novelist and poet Clive James was not expected to live for long after his short-poem collection Sentenced to Life was published, to great acclaim, in 2015.
More recently, as Claudia Rankine subtly argues in her essay-poem collection Citizen, many little incidents led to Serena Williams threatening "to shove the fucking ball down [a line judge's] fucking throat" at the US Open in 2009.
· Luke Kennard won an Eric Gregory Award for his first prose-poems collection The Solex Brothers in 2005.
Until 1901, Mahler's compositions had been heavily influenced by the German folk-poem collection Des Knaben Wunderhorn ("The Youth's Magic Horn"), which he had first encountered around 1887.
Now firmly under the influence of the Wunderhorn folk-poem collection, Mahler produced a stream of song settings at Steinbach, and composed his Second and Third Symphonies there.
At around this time Mahler discovered the German folk-poem collection Des Knaben Wunderhorn ("The Youth's Magic Horn"), which would dominate much of his compositional output for the following 12 years.
