1. Studies of rain drops and rain drop phenomena;Bentley;Mon. Wea. Re,1904
2. Observations on the behavior of water drops at terminal velocity in air;Blanchard,1948
3. The distribution of rain drops in natural rain;Blanchard,1949
4. Experiments with water drops and the interaction between them at termini velocity in air;Blanchard,1949
5. Edgerton, E. K., , J. R., Killian, , Flash: Seeing the unseen by ultra high speed photography, Hale Publishing Company, 1939,