Kirk, William D.J. (IBRA 2006): A Colour Guide to Pollen Loads of the Honey Bee .Kirk, William D.J. (IBRA 2006): A Colour Guide to Pollen Loads of the Honey Bee .Kirk, William D.J. (IBRA 2006): A Colour Guide to Pollen Loads of the Honey Bee .Kirk, William D.J. (IBRA 2006): A Colour Guide to Pollen Loads of the Honey Bee .