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The expansion and contraction of concrete and concrete roads
A pathological survey of the Para rubber tree (Hevea brasiliensis) in the Amazon Valley
A farm management study of cotton farms of Ellis County, Tex
The marketing and distribution of American-grown Bermuda onions
Control of the Argentine ant in California citrus orchards
American bulbs under glass
Experiments in bulb growing at the United States bulb garden at Bellingham
Flumes and fluming
Australian wheat varieties in the Pacific coast area
The cost and utilization of power on farms where tractors are owned : 286 farms, Ohio, Indiana, Illinois, 1920