WEEKS, EDWIN P. FIELD DETERMINATION OF VERTICAL PERMEABILITY TO AIR IN THE UNSATURATED ZONE - WASHINGTON: USDI., 1978 - 41P; ILLUST - US GEOLOGICAL SURVEY PROFESSIONAL PAPER 1051 . ENG Subjects--Topical Terms: SEDIMENTS(GEOLOGY)-PERME4ABILITY.SEDIMENTS(GEOLOGY)-UNITED STATES.