Testing cone ripeness
Series: Technical notes -- no. 176; Technical notes (Lake States Forest Experiment Station (Saint Paul, Minn.)) -- no. 176.
Publisher: Lake States Forest Experiment Station
Published: 1941
Place of publication: St. Paul, Minn
Language: eng
Subjects: Ripening; Seed cones; Cones (Botany); Pinus resinosa; Pinus strobus
Notes: "January 1941."