Henry George. the author of Progress and Poverty, is mentioned by Robert Anton Wilson in a number of places. For example, in the essay "Left and Right: A Non-Euclidian Perspective," reprinted in Email to the Universe, Wilson writes, "I am still fond of the system of Henry George (in which no rent is allowed, but free enterprise is otherwise preserved);" (Others describe George by saying he favored only one kind of tax, a tax on land ownership.)
Jesse Walker has a short review up at Reason magazine on a new book about George, Land and Liberty by Georgetown University historian Christopher William England.
The book shows George's influence on a wide variety of people, Walker says: "In the early 20th century, George's followers found homes in a host of progressive reform movements and progressive-run governments. But other followers—sometimes the same followers—helped create contemporary libertarianism."
ln the usual absurd academic press fashion, even the ebook version unfortunately is quite expensive, about $55, but I guess you can get it at the library if you can't afford it.