Library funding is under threat. Find out how you can show up for libraries: ala.org/showup.
"Combinatorics of permutations.", American Library Association, February 27, 2012
https://www.ala.org/winner/combinatorics-permutations (Accessed May 22, 2025)
Document ID: f714cb5c-df15-4b99-b15d-2aef29b9ea2c
