About USDA Accession Numbers:
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      The presence of a seven or eight digit code in this category indicates 
      that seed of this cultivar has been submitted to the USDA- National 
      Small Grains Collection (NSGC), currently maintained at the National 
      Small Grain Repository in Aberdeen, Idaho.  Identity of wheat 
      cultivars in the NSGC are maintained by use of a cereal investigation
      number for wheat ("CItr") or plant introduction number ("PI") assigned
      by the collection curator.  Prior to 1930, CItr numbers were assigned
      to all wheats developed as cultivars, wheats included in USDA uniform
      testing nurseries or wheats received as foreign introductions.  From
      1930 to 1983, foreign introductions were assigned PI numbers, but not
      CItr numbers.  In 1983, assignment of CItr numbers to cultivars and
      testing lines was discontinued by the collection curator.  Since this
      time, all wheats submitted to the NSGC receive only PI number
      assignments.