Dissertatio medico-obstetricia de foetus per pedes eductione, cujus partem priorem, De versionis indicantibus et contraindicantibus, ... praeside viro nobilissimo &  experientissimo d.no doct, Eberhardo Rosenblad, ... pro gradu doctoris ventilanda exhibet auctor Johannes Kraak ... d. 10. Maji a. 1777
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