Crop rotation and tillage experiments at the North Platte (Nebr.) substation 1907-34.
Zook,L.L.
Crop rotation and tillage experiments at the North Platte (Nebr.) substation 1907-34. - Washington U.S. Dept. of Agri. - 78
633
Crop rotation and tillage experiments at the North Platte (Nebr.) substation 1907-34. - Washington U.S. Dept. of Agri. - 78
633