B. E. Fernow, A Brief History of Forestry
“ Open stand, comparatively poor development, and slow growth, characteristic of northern climate, reduce its productive capacity, while frequent bogs and other natural waste places outside of those produced by mismanagement reduce its productive area by not less than 20 per cent. [259] Toward the south, deciduous species are more frequent, oak finally becoming the prevailing timber and forming forests, with beech, maple, ash and elm as admixtures. As the plains are approached pure deciduous forest indicates the change of climate. ”
