When to pick pine cones
Series: Technical notes / Lake States Forest Experiment Station -- no. 170; Technical notes (Lake States Forest Experiment Station (Saint Paul, Minn.)) -- no. 170.
Publisher: Lake States Forest Experiment Station, University Farm
Published: 1940
Place of publication: St. Paul, Minn
Language: eng
Subjects: Pine cones; Seed cones; Pinus banksiana; Pinus strobus; Pinus resinosa; Specific gravity; Harvesting
Notes: Caption title.