K\.3^\2-0
UNITED STATES DEPARTMENT OF AGRICULTURE
MISCELLANEOUS PUBLICATION NO. 20
WASHINGTON, D. C.
APRIL, 1928
O. S. GOVERNMENT PRINTING OFFICE: 1928
K\.3^\2-0
UNITED STATES DEPARTMENT OF AGRICULTURE
MISCELLANEOUS PUBLICATION NO. 20
WASHINGTON, D. C.
APRIL, 1928
O. S. GOVERNMENT PRINTING OFFICE: 1928