Farm fertilizers
By: [S.A. Knapp]
Contributors: United States. Bureau of Plant Industry
Series: B.P.I -- 631; B.P.I. (United States. Bureau of Plant Industry) -- 631.
Publisher: U.S. Dept. of Agriculture, Bureau of Plant Industry, Farmers' Cooperative Demonstration Work
Published: 1911
Place of publication: Washington D.C
Language: eng
Subjects: Farm manure; Fertilizers
Notes: Caption title.

Signed on p. 8: S.A. Knapp, Special Agent in Charge.

"Approved: G.H. Powell, Acting Chief of Bureau, December 7, 1910"--Page 8.

"Issued January 11, 1911."

"No. "A"--72."