1. Weather Bureau, Commerce Dept. Circular. N. Manual of surface observations (WBAN) 7th edition (revised Oct. 1957 to include Changes 1 to 4), Change 9; Sept. 1961. Bookmark Corporate/Agency Authors: Wage and Hour and Public Contracts Division and Labor Dept. Publisher: Wage and Hour and Public Contracts Division Date: [1961.] SuDoc number: C 30.4:N/957/ch.9