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| Mensuration | | -In forestry, the measurement of both standing and harvested timber ... |
| Merch | | Merchantable ... |
| Merchantable | | Logs exceeding a minimum size and a minimum usable volume ... |
| Merchantable top | | Smallest utilizable top ... |
| Metric tons | | Unit of weight equal to 1,000 kilograms. -Approximately 2,205 pounds ... |
| Mobile | | Capable of being moved from one location to another ... |
| Mobile yarder | | Self-propelled or mobile machine designed to perform cable logging with ... |
| Model | | Theoretical abstraction, usually capable of mathematical manipulation, used to evaluate ... |
| Moisture content | | Amount of water present in a material such as wood ... |
| Molle | | -Circle of twisted strands of wire rope used as a ... |
| Mop-op | | -Mopping up ... |
| Mopping up | | Act of making a fire safe after it has been ... |
| Mortality | | Number or sound wood volume of healthy trees that have ... |
| Multiple entry | | Entering a stand for commercial harvesting more than once in ... |
| Multiple-use | | Practice of forestry that combines two or more objectives ... |
| Multiple-use forestry | | Concept of forest management that combines two or more objectives, ... |
| Multiple-use management | | Management of land resources with the objective of achieving optimum ... |
| Multispan skyline | | Skyline having one or more intermediate supports ... |
| Multistem | | Operation handling two or more stems at the same time ... |
| Muskeg | | Tract of partly forested peatland supporting mosses, shrubby plants, and ... |
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