Hornfaced Bee for Orchard Pollination - Ongoing West Virginia University investigations into the use of these bees on apple orchards. - http://www.wvu.edu/~agexten/ipm/insects/pollinat/progress/romney.htm
Orchard Mason Bees - The orchard mason bee is slightly smaller than a honey bee and a shiny dark blue in color. - http://gardening.wsu.edu/library/inse006/inse006.htm
The Orchard Mason Bee - A page from the North Carolina State University describing how this bee can be an effective pollinator. - http://www.virtualorchard.net/glfgn/february1998/masonbee.html