Unlike most of the states, Iowa has a relatively small area of non-agricultural land, in fact, about ninety per cent of the State is adapted to the production of annual crops. For this reason, if for no other, state or national forests will not be of large extent. The areas which might best be used for timber production are in relatively small units and far separated, making their administration under national or state supervision more difficult than in those states where considerable areas in one locality are suitable only for tree growth.