Childs, George H.2016-03-092016-03-091915https://hdl.handle.net/11299/177935University of Minnesota Masters thesis. 1915. 1 computer file (PDF); 2, 63 pages, 28 unnumbered pages of plates.enSome Observations on the Life History of the Water Springtail (Podura Aquatica - 1758)Thesis or Dissertation