The Encyclopedia of Life in collaboration with Harvard University have now made available the "Bee Observer Cards". These are intended to teach naturalists, teachers, resource managers and other interested public something about the diverse anatomies, natural history, and behaviors of bees.
The cards are not a guide to taxonomic identification, but more a tool to help people observe the remarkable diversity of body structures, nesting habits etc. when they are out in the field.
They are freely available to anyone as a pdf on the EOL website:
See Attached files here: