14 CFR §137.71

1. (a)Each holder of a commercial agricultural aircraft operator certificate shall maintain and keep current, at the home base of operations designated in his application, the following records:
   1. (1)The name and address of each person for whom agricultural aircraft services were provided;
   2. (2)The date of the service;
   3. (3)The name and quantity of the material dispensed for each operation conducted; and
   4. (4)The name, address, and certificate number of each pilot used in agricultural aircraft operations and the date that pilot met the knowledge and skill requirements of § 137.19(e).
2. (b)The records required by this section must be kept at least 12 months and made available for inspection by the Administrator upon request.