Burchard, Ernest Francis (1875-1961) United States of America. Geological Survey.
Burchard, Ernest Francis (1875-1961) United States of America. Geological Survey.
Burchard, Ernest Francis (1875-1961) United States of America. Geological Survey.
Burchard, Ernest F. (1875-1961) United States of America. Geological Survey.
Burchard, Ernest Francis (1875-1961) Stany Zjednoczone. Geological Survey
Burchard, Ernest Francis (1875-1961) Stany Zjednoczone. Geological Survey
Ransome, Frederick Leslie (1868-1935) Burchard, Ernest F. (1875-1961) Stany Zjednoczone. Geological Survey