Still I Persist In Wondering - a rare collection from Edgar Pangborn. Most of the stories in this collection are related, and in the same future as his novel The Company of Glory and the Hugo-nominated Davy - taking place after the Twenty-Minute War and the Red Plague, in a depopulated, balkanized, and somewhat medieval North America. I've read most of these in their source anthologies, and strongly recommend this book.

(Introduction by Spider Robinson)
(Author's note)
The Children's Crusade
Harper Conan and Singer David
The Legend of Hombas
Tiger Boy
The Witches of Nupal
My Brother Leopold
The Night Wind
(Bibliography)

These stories first appeared in the Continuum anthology series edited by Roger Elwood (#1 to #3), Terry Carr's Universe anthology series (#2, #5), and An Exaltation of Stars, plus George Zebrowski's Tomorrow Today (all a little hard to find these days.)