A report by Professor Levin stresses the value of bee pollination in US agriculture. He gives the 1980 values (in US$) of the following groups of crops and commodities produced in the USA: (1) crops that require, or directly benefit from, honeybee pollination (e.g. apples, citrus fruits, sunflower, almonds), (2) crops which result from seed produced by bee pollination (e.g. asparagus, cabbage, carrots, onions), and (3) commodities indirectly dependent on bee pollination (e.g. cattle, liquid milk production: 10% of the total value is credited to bee pollination).