His Explanation in Geography (1969) was a landmark text in the methodology and philosophy of geography, applying principles drawn from the philosophy of science in general to the field of geographical knowledge.
Explanation in Geography (1969) nya merupakan naskah penting bagi metodologi dan filsafat geografi, menggunakan prinsip-prinsip yang terbentang mulai filsafat ilmu yang umum ke bidang pengetahuan mengenai geografi.