Crusade Lore is full of the bits that didn't fit into Sorcerers Crusade core with information on scourgelings, and town layout. Adam and Terry talk port logistics, gabled hats and war balloons in Tomes of Magick: Crusade Lore.
Crusade Lore - This book
Sorcerers Crusade core - The core book
Bygone Bestiary - Next book