A duff hygrometer for measuring forest fire hazards.
Contributors: Forest Products Laboratory (U.S.)
Edition: Rev. Jan. 1947.
Series: Technical note -- no. 238.; Technical note (Forest Products Laboratory (U.S.)) -- no. 238.
Publisher: Forest Products Laboratory, U.S. Forest Service
Published: 1947
Place of publication: Madison, Wis
Language: eng
Subjects: Hygrometers.; Forest litter -- Moisture.
Notes: Caption title.

Also issued online.