The reasons for the publication of a Russian thistle bulletin at this time are two-fold. The first bulletin,* issued in 1894, is nearly exhausted, and as there are numerous requests for the same it has seemed better to revise the old and add such new information as has come to hand. Secondly, we have had sufficient knowledge to enable us to say whether the weed has been as aggressive as it promised to be, and whether the weed has spread to any great extent in this state since 1894.
Pammel, L. H.
"The Russian thistle,"
Bulletin: Vol. 4
, Article 1.
Available at: https://lib.dr.iastate.edu/bulletin/vol4/iss38/1