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| The Encyclopedia of World History. 2001. |
| d. Agricultural Production and Food Technology | |
| 1917 | |
| Clarence Birdseye (1886–1956) began development of method for quick freezing of foods in small containers; placed on market in 1929. | 1 |
| 1939 | |
| Paul Muller synthesized DDT for use as an insecticide. Othmar Zeidler had prepared DDT in 1874, but its insecticidal qualities had not been suspected. | 2 |
| 1940 Ff | |
| Development of artificial insemination to improve livestock breeding. | 3 |
| 1945 Ff | |
| Unit packaging of foodstuffs improved by development of plastic packaging films. Trend toward prepared “convenience” foods for household use. | 4 |
| The Encyclopedia of World History, Sixth edition. Peter N. Stearns, general editor. Copyright © 2001 by Houghton Mifflin Company. Maps by Mary Reilly, copyright © 2001 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved. | |
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