Instructions for Making Forest Maps and Surveys
Forest Service, Gifford Pinchot. mt lines. Tables giving the magnetic variation in all parts of the country l starI for the year 1900 have been published by the United States Geological ... 9 ll a#39; Either of these can be used, preferably the latterI In using the tables ~gm! it must be understood that where the variation is stated to beanbsp;...
| Title | : | Instructions for Making Forest Maps and Surveys |
| Author | : | United States. Forest Service, Gifford Pinchot |
| Publisher | : | - 1905 |
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