Growing and planting hardwood seedlings on the farm. C. R. Tillotson. (U. S. Agriculture dept. Farmers’ bul. 1123) 29p pa ’21
Fortifications
Pamphlet on the evolution of the art of fortification. Major General William M. Black. (U.S. Engineer school. Occasional papers 58) 107p pa ’19
Frost
Frost and the prevention of damage by it. Floyd D. Young. (U.S. Agriculture dept. Farmers’ bul. 1096) 48p pa ’20
Frost protection in lemon orchards. A. D. Shamel and others. (U.S. Agriculture dept. Department bul. 821) 30p pa ’20
Fur trade
Maintenance of the fur supply. Ned Dearborn. (U.S. Agriculture dept. Department circular 135) 12p pa ’20
Furnaces
One-register furnaces (pipeless furnaces) A. M. Daniels. (U. S. Agriculture dept. Farmers’ bul. 1174) 12p pa ’20