George's most famous book was entitled "Progress and Poverty" ... it was dedicated, "to those who, seeing the vice and misery that spring from the unequal distribution of wealth and privilege, feel the possibility of a higher social state and would strive for its attainment." Its subtitle is a mouthful:"an inquiry into the cause of industrial depressions and of increase of want with increase of wealth ... The Remedy."
The book is quite analytical, a logical analysis. If you want to see where it is going, jump to the final "book" before you read the rest.
Or you might start with a collection of essays entitled "Social Problems." They still read well today, and, among other things, show why a Constitution written in the 18th century simply can't be frozen in time, and needs to be reconsidered in light of 21st century realities. Some of my favorite quotes are from "Social Problems."
Both books are online and at Amazon or schalkenbach.org; there is also a fine modern abridgment of P&P, and audio is available at hgchicago.org.