20 USC 107d - Expenditures

(a) Personal services, rent, printing, etc. 
The Secretary is authorized to make such expenditures out of any money appropriated therefor (including expenditures for personal services and rent at the seat of government and elsewhere, books of reference and periodicals, for printing and binding, and for traveling expenses) as he may deem necessary to carry out the provisions of this chapter.
(b) Preference to blind persons in employment 
The Secretary shall, in employing such additional personnel as may be necessary, give preference to blind persons who are capable of discharging the required duties.