Stamp made numerous significant contributions to the field of geography, but perhaps his most notable impact lies in his pioneering work on land classification and mapping. He developed innovative methods for categorizing and mapping different types of landforms, soils, and vegetation, which provided valuable insights into regional variations and environmental dynamics. Stamp's land classification schemes became widely adopted by geographers and land-use planners, facilitating resource management and land-use planning efforts.

Furthermore, Stamp's research on agricultural geography revolutionized the understanding of agricultural systems and their relationship with the environment. He conducted extensive studies on agricultural landscapes, analyzing factors such as soil fertility, climate, and human intervention. His findings helped to inform agricultural policies and practices, promoting sustainable land management and productivity enhancement.

Stamp also played a key role in advancing urban geography through his studies on urbanization, urban growth, and spatial organization of cities. His research shed light on the complex interactions between social, economic, and environmental factors shaping urban landscapes. Stamp's insights into urban dynamics provided valuable guidance for urban planners and policymakers grappling with issues such as urban sprawl, housing, and infrastructure development.