TY - RPRT TI - Spectrographic data for the ash of ground birch (Betula rotundifolia Sarg.) leaves and black spruce (Picea mariana B.S.P.) needles collected from the Tanacross 1:250,000-scale quadrangle, Alaska AU - Gordon W. Day AU - Gary C. Curtin AU - Theodore M. Billings PY - 1979 DO - 10.3133/ofr791355 UR - https://pubs.usgs.gov/publication/ofr791355 ID - ofr791355 ER -