"Tusa (1977) believes that "the so-called 'grave culture' is not in fact due to a sudden interruption in the life of the valley but to an appreciable, substantial change perhaps due to new contributions that are nevertheless in line with the cultural traditions of the previous period." He echoes objections that have been raised so many times by South Asian archaeologists: "The existence of contributions from the outside, for too long used to justify cultural change in the sub-Himalayan area, has in my opinion been exaggerated even though it could conceivably have been a factor in cultural change without being the only one" (690). As far as he is concerned, "to attribute a historical value to . . . the slender links with northwestern Iran and northern Afghanistan . . . is a mistake "because . . ." it could well be the spread of particular objects and, as such, objects that could circulate more easily quite apart from any real contacts" (691-692)."