Resource items don't transfer like normal items. You can give them to others, even take them by ITC codes, but they will group together. For example if player A has 15 wood and player B has 30 wood, player A can only send his entire amount of wood , not fractions, to player B. After the transfer, player B will have 45 wood, undividable! The amount of resources of one type comes written in front of the resource name.