A - Alan Wood Steel

B - Bethlehem Steel

C - Cambria Iron Company

D - Carrie Furnaces

E - Clay Furnace

F - Colebrookedale Furnace

G - Cornwall Furnace

H - Coventry Forge

I - Coventry Steel Furnace

J - Durham Furnace

K - Edgar Thomson Works 

L - G.O. Carlson, Inc.

M - Hopewell Furnace

N - Hussey, Wells, and Company

O - Lukens Steel Company

P - Midvale Steel

Q - Parkesburg  Iron Company

R - Pennsylvania Steel Company

S - Phoenix Steel Corporation

T - Rutter's Bloomery

U - Sarum Forge

V - Scranton Iron Works

W - United States Steel

X - Valley Forge

Y - Worth Brothers Company