1. A mechanical trimmer for crisphead lettuce-refinements, field tests and performance;ADRIAN;Trans. Amer. Soc. Agr. Eng.,1976
2. AGAMALIAN , H. 1979 Personal communication
3. Phytotoxic substances from decomposing lettuce residues in relation to the etiology of corky root rot of lettuce;AMIN;Phytopathology,1966
4. Lettuce tipburn as related to nutrient imbalance and nitrogen composition;ASHKAR;J. Amer. Soc. Hort. Sci.,1971
5. Effects of temperature and moisture on viability of stored lettuce, onion and tomato seeds;BARTON;Contrib. Boyce Thompson Inst. Plant Res.,1966