The term "dry so long" also turns up in the blues as "dry long so" ref. Blind Lemon Jefferson. It apparently means "for no good reason".

"On the Killing Floor" in extreme privation. Ref eg.Son House "Dry Spell Blues" 1930.

Both above from Stephen Calt's book Barrelhouse Words.

I don't feel that it was necessarily the depression that Skip was referring too as for many /(most?) people in the South it was always the depression.

I like the Sumlin story,especially the idea of Wolf having seven girlfriends and a touring bus when he lived in West Milford. If my memory is correct and without checking the biography I think he was still a cotton picker at that time.

Good to see some interest in the blues on this site, it doesn't happen too often