s: Dry Malt Extract (light), 79.0, 3.5, 95.7
m: Amber Malt, 5.1, 35, 69.6
m: Crystal Malt 60L, 5.4, 60, 73.9
m: Chocolate Malt 300L, 3.8, 340, 65.2
m: Roasted Barley (dark), 0.8, 500, 54.3
s: Sucrose (brown sugar), 5.9, 60, 100

All-grain version
og: 1.070
m: Maris otter pale ale, 79, 3.5, 80
m: Amber Malt, 5.1, 35, 70
m: Crystal Malt 60L, 5.4, 60, 74
m: Chocolate Malt 300L, 3.8, 340, 65
m: Roasted Barley (dark), 0.8, 500, 54
s: Sucrose (brown sugar), 5.9, 60, 100
ibu: 50
h: Vanguard, 100, 5.0, 60
y: ale

Source: Extreme Brewing by Calagione, p. 146-7

s: Dry Malt Extract (light), 79.0, 3.5, 95.7

Update: The recipe also has late aroma hops and warrior for bittering. 

Hop #1 Warrior (16% AA) at 60 minutes: 22.7 IBUs; 86.4% of total IBUs
Hop #2 Vanguard (4.85% AA) at 0 minutes: 3.6 IBUs; 13.6% of total IBUs

Total IBUs: 26.3

--- Use the formatted below section for your concise calculator recipe. ---

h: Warrior, 86.4, 16, 60
h: Vanguard, 13.6, 4.85, 0

Note that these IBUs are much lower than 50. 
