He undertook extensive field research among the Flathead Indians of Montana in 1950 ( for his PhD ) and again in 1958 .
Merriam 's initial work was based on fieldwork carried out in his native Montana and central Africa .
Merriam undertook extensive field research among the Flathead Indians of Montana in 1950 ( for Merriam 's PhD ) and again in 1958 .
Merriam 's initial work was based on fieldwork carried out in his native Montana and central Africa .