APPENDIX 217 



map can now be combined to make perfect squares. For exam- 

 ple, number 2 can be combined with number 6 to make a per- 

 fect square, and number 3 with number 5. Proceed in this way 

 until the entire area of the map has been accounted for. The 

 sum of all the different squares in the map will give the area 

 of the woodlot in square feet. If this sum is divided by 43,560, 

 the number of square feet in an acre, the number of acres 

 in the woodlot will be found. 



Bulletins and Circulars giving information on Farm For- 

 estry. — Publications of the State Forestry Department and of 

 the State Agricultural College on the establishment of farm 

 woodlots and their care and protection, the kinds of trees to 

 plant, the wood-using industries of the state, and the market- 

 ing of woodlot products. 



Bulletins and Circulars of the United States Forest Service, 

 a list of which can be obtained from the U. S. Department of 

 Agriculture, Washington, D. C. The following relate to Farm 

 Forestry and can be obtained from the Superintendent of 

 Public Documents, Washington, D. C, by sending a postal 

 money order for the amount: 



U. S. Forest Service Bulletins: 



36 Woodman's Handbook $0.25 



42 Woodlot Handbook for owners of woodlands in 



southern New England 15 



76 How to grow and plant conifers in the Northeastern 



States 10 



78 Wood Preservation in the United States 10 



86 Windbreaks, their influence and value 30 



U. S. Forest Service Circulars : 



61 How to transplant forest trees $0.05 - 



69 Fence post trees 05 



96 Arbor Day, suggestions for its observance 05 



99 Suggestions for forest planting on the semi-arid 



plains 05 



