EMPLOYEE WAS LOADING ROOF BOLTS ON ROOF BOLTER IN PANEL A94. BUNDLE OF 5 FT ROOF BOLTS, 5 TO A BUNDLE. ONE END OF THE BUNDLE LANDED OVER THE TOP OF THE ROOF BOLT RACK & THE OTHER DID NOT. AS H E TURNED TO GET ANOTHER BUNDLE, THE OTHER OF THE BUNDLE FELL STRIKING HIM ON TOP OF LEFT FOOT.