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. 1949 Sep;42(9):745.
doi: 10.1177/003591574904200912.

Obstetric analgesia; a new machine for the self-administration of nitrous oxide oxygen

E H SEWARD

Obstetric analgesia; a new machine for the self-administration of nitrous oxide oxygen

E H SEWARD. Proc R Soc Med. 1949 Sep.
No abstract available

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