Britannica's overview explains how the poem "heard 'round the world" led to a landmark 1957 obscenity trial that fundamentally changed American censorship laws.
If your interest is biological, researchers are currently using new technology to understand why wolves howl and what those sounds actually mean. Howl - Isthmus | Madison, Wisconsin Howl (Aullido)
Depending on whether you're looking for the revolutionary literary masterpiece or the biological phenomenon of nature, there are several excellent resources covering "Howl" (Aullido). 1. The Literary Masterpiece: Allen Ginsberg's "Howl" Britannica's overview explains how the poem "heard 'round