As to any work or supplies covered by or to be covered by contract between the district and the United States the provisions of section 43-901 shall not apply.

[(43-1805) R.C., sec. 2416; am. 1915, ch. 143, sec. 10, p. 304; reen. C.L. 167:5; C.S., sec. 4470; I.C.A., sec. 42-1805.]