Field operations of the bureau of soils

Míreanna comhchosúla

• Provisional soil map
  de réir: Wright A. C. S.
  Foilsithe / Cruthaithe: (1958)
• Geologic map and strucrure sections of the rock creek oil field and adjoining areas, Wyoming
  de réir: Estados Unidos Geological Survey
  Foilsithe / Cruthaithe: ([ca 1929])
• Map of the Western part of the northward extension of the sheridan coal field, rosebud and big horn counties, Montana
  de réir: Estados Unidos Geological Survey
  Foilsithe / Cruthaithe: ([ca 1929])
• Map of the Eastern part of the northward extension of the sheridan coal field, rosebud and big horn counties, Montana
  de réir: Estados Unidos Geological Survey
  Foilsithe / Cruthaithe: ([ca 1929])
• Map of Calvert county showing the Agricultural soils
  de réir: Clark William Bullock, et al.
  Foilsithe / Cruthaithe: (1902)