GRANT AND CROSSMAN |
USA, 1858-61, MIM |
Burt's Solar Campasses = P.C., Michigan Museum of Surveying, Lansing. |
Michigan Museum signed "W.A. Burt Inventor / Detroit, Mich. / No. 6 / University of Michigan / Grant and Crossman / Makers." |
Detroit, Mich. |
USNM; Leiserowitz. |