Twenty-fifth anniversary of the bureau of standards

IEEE | 1927

Twenty-fifth anniversary of space exploration 1957 - 1982 : [ commemorating the siver anniversary of the age of space exploration 1957 - 1982

Sherman, Madeleine W. | TIBKAT | 1983

Twenty-Fifth Annual Convention

Engineering Index Backfile | 1949

Eighty fifth anniversary of professor Zbigniew Kaczkowski

British Library Online Contents | 2006

Special section: Fifth anniversary of 9/11

British Library Online Contents | 2006