[BLOOD DONATIONS AND POPULATION DENSITY. ATTEMPTED  ESTABLISHMENT OF A SIMPLE MATHEMATICAL RATIO].
D001699:Biometry; D001782:Blood Donors; D005602:France; D006801:Humans; D011153:Population; D011156:Population Density; D013223:Statistics as Topic
BLOOD DONORS; FRANCE; POPULATION; STATISTICS
DONS DE SANG ET DENSIT'E DE POPULATION. ESSAI D''ETABLISSEMENT D'UNE RELATION MATH'EMATIQUE SIMPLE.