TY  - RPRT
TI  - Preparation for labor: a historical perspective.
AU  - N C Beck
AU  - E A Geden
AU  - G T Brouder
PY  - 1979
DO  - 10.1097/00006842-197905000-00007
UR  - https://pubmed.ncbi.nlm.nih.gov/382225/
ID  - 382225
ER  -