1. Effect of dilution upon the infectivity of the virus of the mosaic disease of tobacco;Allard;J. Agric. Res.,1915
2. Some properties of the virus of the mosaic disease of tobacco;Allard;J. Agric. Res.,1916
3. Advance in botany is led by 3 women;Anon,1937
4. Helen A. Beale, research scientist, world traveler;Anon,1976
5. “Serological tests for the identification of plant viruses.”;Ball,1961