Progress and Poverty by Henry George occupies an odd place in libertarian history – at once inspiring a generation towards anti-statism and yet also diverting many onto the land tax idea.
Never Ask The End, by Isabel Paterson, seems to be a literary/fictional autobiography. Please someone read it and report back.
An Inflation Primer, by Melchoir Palyi, is of course solid.
Keynes, the Man, by Murray Rothbard, is a rip-roaring mini-bio by the greatest writer in economics.
Illusions of Point Four, by Henry Hazlitt, is a lost classic.
Honest Money, by Gary North, demonstrates that the Hebrew scriptures condemned inflation.
Forgotten Lessons, by John T. Flynn, contains many otherwise inaccessible essays.