Josie Dew's books are a good read, e.g. Wind in my Wheels, Travels in a Strange State
Second your nomination of Barbara Savage
Marty Basch has two interesting books including Against the Wind
Cold Beer and Crocodiles by Roff Smith (and more so his National Geographic articles) inspired
me prior to riding around Australia
I'm not much of a Dervla Murphy fan but she comes well recommended
Scott Zamek's book One More Horizon is pretty impressive though also an example
of not the best advanced planning

My bookshelf has half a dozen other touring accounts, but list above include my favorites.