Attached below are articles on carrot, onion, and table beet that may serve as useful references for these crops
Alliums, by Havey
Beetroot, by Pink
Breeding Biennial Crops, by Goldman
Biennial Crops, by Goldman
Carrot Breeding, by Stein and Nothnagel
CarrotBreeding, by Peterson and Simon
Carrot Characteristics, by Simon
Carrot Facts, by Simon
Domestication of Carrot, by Simon
History of Onions, by Gabelman
History and Pedigree of Public Onion Releases in the United States, by Goldman and Havey
Onion Breeding, by Pike
Onion, by Havey
Onions and Garlic, by Brewster
Sugarbeet, by Brian Ford-Lloyd
Table Beet Breeding, by Gabelman, Bliss, and Engle