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  Search result  Your search for [author]De Ong, Elmer Ralph. returned 3 records.  
 
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  Book Insect, disease and weed control.

by De Ong, Elmer Ralph.; N.Y.: Chemical Pub. Co., 1972.

Subject: Pest control; Weed control; Plant diseases.

  
     
Relevance: 28.71%
 
     
  Book Chemistry and uses of insecticides.

by De Ong, Elmer Ralph, 1882; New York: Reinhold Pub. Corp, 1948.

Subject: Insecticides.

  
     
Relevance: 24.51%
 
     
  Book Chemistry and uses of pesticides.

by De Ong, Elmer Ralph, 1882; New York: Reinhold Pub. Corp, 1956.

Subject: Insecticides.

  
     
Relevance: 24.51%
 
     
 
         
         
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