There are 3 books in the Travel Trilogy series. The newest book is River-Horse which came out in 1999.

Hailed as a masterpiece of American travel writing, Blue Highways is an unforgettable journey along our nation's backroads.
William Least Heat-Moon set out with little more than the need to put home behind him and a sense of curiosity about "those little towns that get on the map -- if…
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3
River-Horse

River-Horse
The acclaimed author of Blue Highways and PrairyErth chronicles his journey across America's waterways in his dory Nikawa (River Horse), encountering strange people, hostile cities, and hair-raising dangers. Tour.