Subpart A of this part 780 and this subpart I constitute the official interpretative bulletin of the Department of Labor with respect to the meaning and application of section 13(b)(15) of the Fair Labor Standards Act of 1938, as amended. This section provides an exemption from the overtime pay provisions of the Act for two industries (a) for employees engaged in ginning of cotton for market in any place of employment located in a county where cotton is grown in commercial quantities and (b) for employees engaged in the processing of sugar beets, sugar-beet molasses, sugarcane or maple sap, into sugar (other than refined sugar) or syrup. The limited overtime exemptions provided for cotton ginning and for sugar processing under sections 7(c) and 7(d) (see part 526 of this chapter) are not discussed in this subpart.