(12) Trees counteract adverse conditions of city life.
Let us all try to make Arbor Day what it should be, a day for caring for and planting trees, for thus we may preserve this most important heritage of our nation.
[16] Elizabeth Bisland and Anne Hoyt, Seekers in Sicily. John Lane Company.
Reference Books
elementary
Hunter, Laboratory Problems in Civic Biology. American Book Company.
Mayne and Hatch, High School Agriculture. American Book Company.
Murrill, Shade Trees, Bul. 205, Cornell University Agricultural Experiment Station.
Pinchot, A Primer of Forestry, Division of Forestry, U. S. Department of Agriculture.
advanced