Directories -- Directories 31 Civil service -- 10 Officials and employees -- 10 Government -- 8 Handbooks, manuals, etc 7 Handbooks, manuals, etc. -- 7 more ... Industries -- 7 Periodicals -- 7 Libraries -- 6 Business enterprises -- 5 Biography -- 4 Commerce 4 Corporations -- 4 Economics -- 4 Manufacturers -- 4 Manufactures -- 4 Commerce -- 3 Economic -- 3 Europe -- 2 Heads of state -- 2 Information services -- 2 Legislators -- 2 Politicians -- 2 Statesmen -- 2 Administrative agencies -- 1 Archival resources -- 1 Archives -- 1 Certification -- 1 Commercial products -- 1 less ...