Columbia subject headings:
Electrical engineers--United States--Biography.
Page, Charles Grafton, 1812-1868.
United States. Patent Office--History.
Harvard subject headings:
Electrical engineers--United States--Biography
Page, Charles Grafton, 1812-1868.
United States. Patent Office--History.
Princeton subject headings:
Electrical engineers--United States--Biography.
Page, Charles Grafton, 1812-1868.
United States. Patent Office--History.