List of maps, preliminary charts, cf:Ac. ... 1, 200, 000 Preliminary chart.-. . . Do. .... Of this number thirty-seven altos and thirty-two bassos, or sixty~nine in all, were available for perpetuating the engraved plates, and for furnishing printed charts.
|Title||:||Report of the Superintendent ... Showing the Progress of the Work|
|Author||:||U.S. Coast and Geodetic Survey|