Home › Authors › Samuel James MacIntosh Allen 👤 Samuel James MacIntosh Allen b. 1877 ยท 1 book Books by Samuel James MacIntosh Allen The velocity and ratio e/m for the primary and secondary [Beta] rays of radium .. 1906
![The velocity and ratio e/m for the primary and secondary [Beta] rays of radium ..](https://covers.openlibrary.org/b/id/7223145-L.jpg)