Counting ruler pregnancy calendar
A. V. Koltsova
Kazan medical journal ›› 1940, Vol. 36 ›› Issue (4) : 88 -88.
The calendar of A. V. Koltsova, demonstrated at the scientific conference of TsNIAGI in Leningrad and in the Leningrad Obstetric and Gynecological Society and approved by them, was published by the State Central Research Obstetric and Gynecological Institute of the USSR NKH for wide distribution.
Koltsova A.V.
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