Richter, D. H., Duffield, W. A., Sawyer, D. A., Schmoll, H. R., and Ratte, J. C., 1994, Geologic map of the Gulkana A-1 Quadrangle, south-central Alaska: U.S. Geological Survey Geological Quadrangle Map GQ 1728, unpaged, 1 sheet, scale 1:63,360.
Richter, D. H., Smith, J. G., Schmoll, H. R., and Smith, R. L., 1993, Geologic map of the Nabesna B-6 Quadrangle, south-central Alaska: U.S. Geological Survey Geological Quadrangle Map GQ 1688, unpaged, 1 sheet, scale 1:63,360.
Richter, D. H., Ratte, J. C., Schmoll, H. R., Leeman, W. P., Smith, J. G., and Yehle, L. A., 1989, Geologic map of the Gulkana B-1 quadrangle, south-central Alaska: U.S. Geological Survey Geological Quadrangle Map GQ 1655, 1 p., 1 sheet, scale 1:63,360.