Since I couldn't find anything /exactly/ like this specifically, I made a table to visually represent the Countess's rune drops for each difficulty : r/diablo2
Crota's End loot table: drops, armor, weapons, and more - Dot Esports
Magic Find in Diablo 2
All of my Diablo 2: Resurected Beta Loot. Everything was solo self-found. : r/diablo2