H.R. 258. to amend the District of Columbia Sales Tax Act to increase the rate of tax imposed on certain gross receipts. and for other purposes. Calendar No. 671. S. 1130. to amend title II of the Public Health Services Act to authorize grants for improving domestic agricultural migratory workers health. service. and conditions. Calendar No. 672. S. 1126. to provide for the registration of contractors of migrant agricultural workers and for other purposes. Calendar No. 673. S. 1123. to amend section 13(c) of the Fair Labor Standards Act of 1938 with respect to the exemption of agricultural employees from the child labor provisions of such act.