Big Boston 
Great Lakes—w.s, 82 days 
Head—large, firm, outer leaves very dark 
green, blistered, well folded with tend- 
ency to heavy mid-rib. 
All America winner developed by U. S. 
Dept. of Agric. in conjunction with 
Michigan State College. A sure heading 
variety with considerable resistance to 
tip burn. A favorite with home, market 
gardeners and long distance shippers 
because of its ability to head under ad- 
verse conditions. 
Iceberg—w.s. 82 days 
Head—medium size, leaves tightly folded 
and crinkled, light green, tinged with 
brown; crisp white interior. 
Very popular for home and local market 
gardens. Fine flavor. Not as popular as 
New York types but stands more heat. 
Iceberg 
Imperial 847—b.s. 84 days 
Head—medium large, solid, well covered 
by heavily blistered outer leaves. 
Resistant to brown blight and tip burn, 
and stands up well in hot summer 
weather. 
Imperial 44—w.s. 82 days 
Head—medium in size, long leaves fold- 
ing well over a good firm head. Lighter 
green, more heavily crumpled and 
coarser leaf edge than New York. 
Especially well liked in the East and 
Southeast where it is rated one of the 
surest heading varieties during hot 
weather. More resistant to tip burn 
than Imperial 152. 
Rogueing a Northrup, King lettuce seed production field in Idaho 
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