400 1 _
‡a
Harrison, John
‡d
1693-1776.
‡t
Principles of Mr. Harrison's Time-keeper, with plates of the same; published by order of the Commissioners of Longitude
400 1 _
‡a
Harrison, John
‡d
1693-1776.
‡t
Principles of mr harrison's time-keeper... published by order of the commissioners of longitude. [with notes by nevil maskelyne
400 1 _
‡a
Harrison, John
‡d
1693-1776.
‡t
Principles of mr. harrison's time-keefer, with plates of the same
400 1 _
‡a
Harrison, John
‡d
1693-1776.
‡t
Principles of mr. harrison's time-keeper : with plates of the same ; publ. by order of the commissioners of longitude