The Exclusion of Colpoda (Ciliata) from Superficially Favorable Habitats April 23, 2015 David H. Leave a comment http://www.jstor.org/discover/10.2307/1933030?uid=2129&uid=2&uid=70&uid=4&sid=21106117981451
Leaf-out phenology of temperate woody plants: from trees to ecosystems April 22, 2015 David H. Leave a comment http://onlinelibrary.wiley.com/doi/10.1111/j.1469-8137.2011.03803.x/full
Pennsylvania turnpike tunnels April 15, 2015 David H. Leave a comment http://www.pennlive.com/projects/2015/pa-turnpike-tunnels/