According to the book Leadbelly-No stranger to the blues, the strings are as follows:
High E: .014
B:          .019
G:       2 .022 wound
D:         .038; .019
A:         .048; .019
Low E: .070; .014

it's a double octave, but i guess if you're no into the whole double octave thing you do a .070 and a .022 or .024.