"Geología Estados Unidos Colorado." . . "Geological Survey (U.S.)," . . "Berilio Menas Estados Unidos Colorado." . . . . . . "Geology and beryllium deposits of the Lake George (or Badger Flats) beryllium area, Park and Jefferson Counties, Colorado" . . . . . . . . . "Geology and beryllium deposits of the Lake George <or Badger Flats> beryllium area, Park and Jefferson Counties, Colorado" . . . "Geology and beryllium deposits of the Lake George (or Badger Flats) beryllium area, Park and Jefferson Counties, Colorado : a study of the nonpegmatitic beryllium deposits, with special emphasis on their association with the late Precambrian Redskin Granite" . . . . . . . .