Viktoras W. Skema

• Analyses and measured sections of Pennsylvania bituminous coals, Part II
• Analyses and measured sections of Pennsylvania bituminous coals. part III / by Viktoras W. Skema, William E. Edmunds, Albert D. Glover, Jon D. Inners, Mark A. Sholes
• Coal resources of Washington County, Pennsylvania / compiled by Viktoras W. Skema.
• Coal resources of Westmoreland County, Pennsylvania
• Coal resources of Westmoreland County, Pennsylvania / compiled by Viktoras W. Skema.
• The economic geology of the Upper Freeport coal in northeastern Greene County, Pennsylvania