Cornell University’s Master Beekeeping Program has a number of valuable resources. Visit their Beekeeping Resources Page.
Included is a very informative Beekeeping Year Calendar page, and a also available PDF here for offline reference. Though it’s written for the Northeastern U.S., Indiana Beekeeping is reflected in this content.
(Note: the link changes from time to time, so we’ll try to check back and update it since this is a great resource. -JF)