. . "Dudley Observatory. Trustees." . . . . "Who withholds co-operation? : correspondence between the officers of the Board of Trustees of the Dudley Observatory, and the director of the same institution"@en . . . . "Who withholds cooperation? : correspondence between the Officers of the Board of Trustees of the Dudley Observatory and the Director of the same institution"@en . . . . . . . . . . . .