A grain store is defined as a store where most agricultural products are stored especially grains. A grain store will have food reserves in great quantity.

Lewis Gulick has written:

'The U.S. proposal for an international grain reserves system' -- subject(s): Food supply, Grain trade

David J Eaton has written:

'A systems analysis of grain reserves' -- subject(s): Grain trade, Food supply

Not sure if this is a math/ statistics question. Reserves are assets you hold, but are not using immediately. There are oil reserves, mineral reserves (like gold reserves) and cash reserves.

I think you need to rephrase the question for a proper answer.

Proven reserves are reserves we know about, potential reserves are those we suspect are present in certain geological formations. The combination of the two along with the estimated size of these reserves gives us the estimated total reserves.