Clue scroll (medium)

Which NPCs drop Clue Scrolls?

 * Camp Humans
 * Cockatrice
 * Abyssal Leech
 * Pyrefiend
 * Harpie Bug Swarm
 * Black Guard
 * Rellekka Warriors
 * Market Guard
 * Jorge
 * Ice Warrior
 * Abyssal Guardian
 * Paladin
 * Vampire
 * Dagannoth
 * Giant Skeleton
 * Abyssal Walker
 * Wallasalki
 * Mummy
 * Giant Rock Crab
 * Giant Rock Crab