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Fig. 10.
Narrow frames with steam heat. New Bern. N. C.
Fig. 11.-Lettuce growing in city lot. Fayetteville, N. C.
Fig. 12.--Lettuce frames on small suburban place. Fayetteville, N. C.
Fig. 13.-Lettuce culture in wide frames, showing heating and irrigating pipes. Truck Test Farm, Pender County, N. C.
Covers reefed to admit sunlight.
Fig. 14.-Lettuce growing in wide frames under Skinner irrigation system. Truck Test Farm, Pender County, N. C.