These doorways in modern Harappa show how a town grows into a mound. Dust and dirt in streets slowly collect and cover doorways. Ultimately they are abandoned and new doorways and buildings are constructed above them.
A good counter example to "Great Granary" having been used to store grain is this actual granary popular in the villages surrounding Harappa. Grain is stored in earthen structures, and accessed as needed through a re-sealable hole at the bottom.
No "Great Bath" like that in Mohenjo-daro has been found in Harappa, and it is not known if one existed among the miles of ruins carted off for railway construction in the early 1850's.
New possibilities might be forthcoming in the next two years [as written in 1998]. Excavations are due to begin in the small parts of the granary not completely excavated by the first archaeologists at Harappa, R. B. D. R. Sahni and M.S.