Directions for collecting flowering plants and ferns
By: S.F. Blake
Series: Department circular / United States Department of Agriculture -- 76; Department circular (United States. Dept. of Agriculture) -- 76.
Publisher: U.S. Dept. of Agriculture
Published: 1920
Place of publication: Washington, D.C
Language: eng
Subjects: Plants; Collection and preservation; Ferns
Notes: Cover title.

"Contribution from the Bureau of Plant Industry (Office of Economic and Systematic Botany)."