1 март 1963 г. - Master Sample Survey

Описание:

- provided continuing information on health cnditions and health care utilizaiton pattterns of representativ esaple of PR population

- spcoa; scoemce imot wotjom de[ pf jea;tj a;sp provided insturments for speical studies related to helath and welfar srvices; funded by russel sage foundation (covering mental health, occupational accident,s social change)

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