In 1929, President Herbert Hoover signed into law the Migratory Bird Conservation Act, which authorized the federal government to purchase or lease land for the establishment of waterfowl refuges. In 1934, President Roosevelt signed into law the Migratory Bird Hunting Stamp Act, which generated revenue for purchase of waterfowl refuge lands by requiring bird hunters using federal land to purchase a "duck stamp" (essentially a permit allowing them to hunt fowl). In 1935, the Roosevelt administration began to consider whether a "Fort Peck Migratory Bird Refuge" should be established around the soon-to-be-filled Fort Peck Reservoir. Noted wildlife biologist Olaus Murie was sent to the area to document the soils, topography, vegetation, and wildlife in the area. Murie's comprehensive report proved critical in convincing the Roosevelt administration that the area around Fort Peck Reservoir should be a wildlife refuge, not merely for birds.