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|Additional Physical Format:||Online version:
Ryder, Edward J., 1929-
Evaluation of lettuce varieties and breeding lines for resistance to common lettuce mosaic.
Washington] U.S. Agricultural Research Service 
|All Authors / Contributors:||
Edward J Ryder; United States. Department of Agriculture.
|Description:||8 pages illustrations 24 cm.|
|Series Title:||Technical bulletin (United States. Department of Agriculture), no. 1391.|
|Responsibility:||[by Edward J. Ryder.|