A close view of the plan for Mound F (where the so-called "Great Granary" is located) at Harappa from Madho Sarop Vats, Excavations at Harappa, Delhi, 1940, pp. 17, which was published some 16 years after Sahni's excavations here during the 1923-24 season. During this season, Sahni excavated four trenches in Mound F, including a corner of the so called "Great Granary" area, which he designated as Trench A, and trenches A(a) and A(b) on the northwest of Mound F.
Vats reports that:
"The course of his operations here he succeeded in tracing out, in 1923-24, a little more than the southern half of the Eastern Block of the Great Granary and a small part of the Western Block also. In describing the portion uncovered by him the Rai Bahadur observed, that “The most important architectural discovery (PI. XXIV, c] of the year was made about the centre of this mound which, though only partially exposed, already embraces an area of 106 feet from east to west by 120 feet from north to south. The purpose and character of this building are shrouded in mystery, but it may be hoped that further exploration will supply the explanation."
- Madho Sarup Vats, 1940. Excavations at Harappa: Being an account of archaeological excavations at Harappa carried out between the years 1920-21 and 1933-34. Volume I - Text; Volume II - 139 Plates., pg 18.
Excerpts from Vats' description of the "six large trenches" sunk into the mound are available at Mound F Harappa Site Map.