Tom has travelled extensively in Europe and Africa since the early 1970s, and has kept sketch diaries, watercolors and illustrated journals from many trips. During the 1980s he collected many of his travel images into a series of prints for his hand printed book: "Walls: A Journey Across Three Continents". Some of these European and African images are shown below. Many involve Killion's early experiments with elaborate multi-block reduction cuts and multiple key blocks. All prints are limited editions, signed and numbered.