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General Land Office |
 | | The maps of historic vegetation on this website, reconstructed from General Land Office survey records, are a reliable depiction of the range of forest composition in the northern Lake States over a long time period, with the exception of areas inside the boundaries of fire-susceptible ecosystems. |
 | | GLO records have been used for many years to provide information on tree species composition, diameter size distribution, and disturbance patches in the pre-European settlement forests of the Lake States (Cottam 1949, Stearns 1949, Bourdo 1956, 1983, Cottam and Curtis 1956, Curtis 1959, Loucks 1983, Whitney 1986, 1987, Frelich 1995). |
 | | Maps generated from GLO data are based on a single measurement of forest conditions during the early to mid-nineteenth century. |
| www.ncrs.fs.fed.us /gla/histveg/glo.htm (2008 words) |
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