Each winter the State of Minnesota conducts a complete reconnaissance of State owned timber and timber lands. Much of this land has never been mapped and only the section lines have been run. The winter period is chosen for several reasons. The energies of the field force are directed toward the prevention of fires during the summer season. Much of the territory to be cruised is practically inaccessible in the summer and only after the rivers and swamps freeze is it feasible to try any work. It has been found that the work can be done as quickly and as efficiently in the winter as in the summer.
Prout, C. W.
"Reconnaissance on the Arrowhead,"
Ames Forester: Vol. 15
, Article 13.
Available at: https://lib.dr.iastate.edu/amesforester/vol15/iss1/13