Important insecticides
Marlatt, C.L.
Important insecticides Direction for their preparation and use - Washington 1901 - 1-42 p. - Insecticides United States Depatment of Agriculture. Farmers Bulletin No. 127 .
Important insecticides Direction for their preparation and use - Washington 1901 - 1-42 p. - Insecticides United States Depatment of Agriculture. Farmers Bulletin No. 127 .