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![Cover for Helmut Ruska · Der Stand Der Bakteriophagenforschung (Paperback Book) [1943 edition] (1943)](https://imusic.b-cdn.net/images/item/original/488/9783662276488.jpg?helmut-ruska-1943-der-stand-der-bakteriophagenforschung-paperback-book&class=scaled&v=1493934754)
![Cover for Helmut Ruska · Morphologische Befunde Bei Der Bakteriophagen Lyse (Paperback Book) [1942 edition] (1942)](https://imusic.b-cdn.net/images/item/original/213/9783662269213.jpg?helmut-ruska-1942-morphologische-befunde-bei-der-bakteriophagen-lyse-paperback-book&class=scaled&v=1493934754)