Gary Fish,
http://rd.springer.com/article/10.1007%2Fs10393-013-0870-2 Conclusions - Causes of long-term declines of honey bees in the U.S.
http://rd.springer.com/article/10.1007%2Fs10393-013-0870-2 Conclusions - Causes of long-term declines of honey bees in the U.S.
http://rd.springer.com/article/10.1007%2Fs10393-013-0870-2 Conclusions - Causes of long-term declines of honey bees in the U.S.