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johnson grass eradication. N. Mex. Agr. Expt. Sta. Bull. 146, 15 pp., 

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THE RUSSIAN THISTLE (SALSOLA KALI L. VARIETY TRAGUS D. C.). Iowa Agr. 



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THE CANADA THISTLE AND DANDELION. Iowa Agr. Expt. Sta. Bull. 61, pp. 



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some weeds of iowa. Iowa Agr. Expt. Sta. Bull. 70, pp. [297]-531. 1903. 



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SOME WEEDS OF IOWA, FLORIDA, LOWER RIO GRANDE VALLEY, CUBA AND INDIA 



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some new weeds of iowa. Iowa Agr. Expt. Sta. Circ. 98, 16 pp., illus. 

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the weed flora of iowa. Iowa Geol. Survev Bull. 4. rev. 715 pp., illus. 

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PERENNIAL PEPPERGRASS, A NOXIOUS WEED IN COLORADO. Colo. Agr. Expt. 



Sta. Bull. 264, 10 pp., illus. 1920. 



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weeds: losses, agencies in distribution, nature, and control. Utah 

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weeds and their control. S. Dak. Agr. Expt. Sta. Bull. 211, 84 pp., illus. 

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WEEDY ABANDONED LANDS AND THE WEED HOSTS OF THE BEET LEAF HOPPER. 



U. S. Dept. Agr. Circ. 229, 24 pp., iUus. 1932. 

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THE PRESENT STATUS OF THE RUSSIAN THISTLE IN WASHINGTON. Wash. Agr. 



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CANADA THISTLE AND QUACK GRASS ERADICATION. Iowa Agr. Col. Ext. SerV. 



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weeds and their control. Iowa Agr. Col. Ext. Bull. 171, 32 pp., illus. 

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SOW THISTLES AND OTHER WEEDS OF SIMILAR HABITS. N. Dak. Agr. Col. Ext. 



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THE IDENTIFICATION AND CONTROL OF COLORADO WEEDS. Colo. Agr. Expt. 



Sta. Bull. 251, 123 pp., illus. 1919. 



